diff --git a/.luacheckrc b/.luacheckrc
new file mode 100644
index 0000000..49fd43a
--- /dev/null
+++ b/.luacheckrc
@@ -0,0 +1,28 @@
+unused_args = false
+
+ignore = {
+    "131", -- Unused global variable
+    "432", -- Shadowing an upvalue argument
+}
+
+read_globals = {
+    "core",
+    "minetest",
+    "default",
+    "worldedit",
+    "tubelib2",
+    "intllib",
+    "DIR_DELIM",
+    "techage",
+
+    string = {fields = {"split", "trim"}},
+    vector = {fields = {"add", "equals", "multiply"}},
+    table =  {fields = {"copy", ""}},
+}
+
+globals = {
+    "hyperloop",
+    "ItemStack",
+    "screwdriver",
+}
+
diff --git a/booking.lua b/booking.lua
index c9536f1..7096368 100644
--- a/booking.lua
+++ b/booking.lua
@@ -13,11 +13,11 @@
 
 -- for lazy programmers
 local SP = function(pos) if pos then return minetest.pos_to_string(pos) end end
-local P = minetest.string_to_pos
-local M = minetest.get_meta
+--local P = minetest.string_to_pos
+--local M = minetest.get_meta
 
 local S = hyperloop.S
-local NS = hyperloop.NS
+--local NS = hyperloop.NS
 
 local tBlockingTime = {}
 local tBookings = {}  -- open bookings: tBookings[SP(departure_pos)] = arrival_pos
@@ -33,7 +33,7 @@ function hyperloop.reserve(departure_pos, arrival_pos, player)
 		hyperloop.chat(player, S("Station data is corrupted. Please rebuild the station!"))
 		return false
 	end
-	
+
 	if (tBlockingTime[SP(departure_pos)] or 0) > minetest.get_gametime() then
 		hyperloop.chat(player, S("Station is still blocked. Please try again in a few seconds!"))
 		return false
@@ -41,7 +41,7 @@ function hyperloop.reserve(departure_pos, arrival_pos, player)
 		hyperloop.chat(player, S("Station is still blocked. Please try again in a few seconds!"))
 		return false
 	end
-	
+
 	-- place a reservation for 20 seconds to start the trip
 	tBlockingTime[SP(departure_pos)] = minetest.get_gametime() + 20
 	tBlockingTime[SP(arrival_pos)] = minetest.get_gametime() + 20
@@ -55,7 +55,7 @@ function hyperloop.block(departure_pos, arrival_pos, seconds)
 	elseif Stations:get(arrival_pos) == nil then
 		return false
 	end
-	
+
 	tBlockingTime[SP(departure_pos)] = minetest.get_gametime() + seconds
 	tBlockingTime[SP(arrival_pos)] = minetest.get_gametime() + seconds
 	return true
@@ -67,14 +67,14 @@ function hyperloop.is_blocked(pos)
 	if Stations:get(pos) == nil then
 		return false
 	end
-	
+
 	return (tBlockingTime[SP(pos)] or 0) > minetest.get_gametime()
 end
 
 
 function hyperloop.set_arrival(departure_pos, arrival_pos)
 	tBookings[SP(departure_pos)] = arrival_pos
-end	
+end
 
 function hyperloop.get_arrival(departure_pos)
 	-- Return and delete the arrival pos
diff --git a/booking_node.lua b/booking_node.lua
index 4f0ae13..9ae939f 100644
--- a/booking_node.lua
+++ b/booking_node.lua
@@ -18,9 +18,8 @@ local M = minetest.get_meta
 
 -- Load support for intllib.
 local S = hyperloop.S
-local NS = hyperloop.NS
 
--- Used to store the Station list for each booking machine: 
+-- Used to store the Station list for each booking machine:
 --    tStationList[SP(pos)] = {pos1, pos2, ...}
 local tStationList = {}
 
@@ -33,7 +32,7 @@ local function generate_string(sortedList)
 	default.gui_bg..
 	default.gui_bg_img..
 	default.gui_slots..
-  	"item_image[0,0;1,1;hyperloop:booking]"..
+	"item_image[0,0;1,1;hyperloop:booking]"..
 	"label[4,0; "..S("Select your destination").."]"}
 	tRes[2] = "tablecolumns[text,width=20;text,width=6,align=right;text]"
 
@@ -80,7 +79,7 @@ local function filter_subnet(sortedList, subnet)
 		if subnet == "" then
 			subnet = nil
 		end
-		
+
 		local tbl = {}
 		for idx,item in ipairs(sortedList) do
 			if item.subnet == subnet then
@@ -95,7 +94,6 @@ end
 -- Used to update the station list for booking machine
 -- and teleport list.
 local function station_list_as_string(pos, subnet)
-	local meta = M(pos)
 	-- Generate a name sorted list of all connected stations
 	local sortedList = Stations:station_list(pos, pos, "name")
 	-- remove all junctions from the list
@@ -108,7 +106,7 @@ local function station_list_as_string(pos, subnet)
 	return generate_string(sortedList)
 end
 
-local naming_formspec = nil
+local naming_formspec
 
 if hyperloop.subnet_enabled then
 	naming_formspec = function(pos)
@@ -185,7 +183,7 @@ local function on_receive_fields(pos, formname, fields, player)
 					booking_info = string.trim(fields.info),
 					subnet = subnet,
 			})
-			
+
 			local meta = M(pos)
 			meta:set_string("sStationPos", SP(stationPos))
 			meta:set_string("infotext", "Station: "..station_name)
@@ -217,7 +215,7 @@ local function on_receive_fields(pos, formname, fields, player)
 		end
 	end
 end
-	
+
 local function on_destruct(pos)
 	local sStationPos = M(pos):get_string("sStationPos")
 	if sStationPos ~= "" then
@@ -229,7 +227,7 @@ local function on_destruct(pos)
 	end
 end
 
--- wap from wall to ground 
+-- wap from wall to ground
 local function swap_node(pos, placer)
 	pos.y = pos.y - 1
 	if minetest.get_node_or_nil(pos).name ~= "air" then
@@ -255,7 +253,7 @@ minetest.register_node("hyperloop:booking", {
 		"hyperloop_booking.png",
 		"hyperloop_booking_front.png",
 	},
-	
+
 	drawtype = "nodebox",
 	node_box = {
 		type = "fixed",
@@ -263,13 +261,13 @@ minetest.register_node("hyperloop:booking", {
 			{ -8/16, -8/16, 2/16,  8/16,  8/16, 8/16},
 		},
 	},
-	
+
 	after_place_node = function(pos, placer, itemstack, pointed_thing)
 		naming_formspec(pos)
 		swap_node(pos, placer)
 	end,
 
-	on_rotate = screwdriver.disallow,	
+	on_rotate = screwdriver.disallow,
 	on_receive_fields = on_receive_fields,
 	on_destruct = on_destruct,
 	on_rightclick = on_rightclick,
@@ -293,7 +291,7 @@ minetest.register_node("hyperloop:booking_ground", {
 		"hyperloop_booking.png",
 		"hyperloop_booking_front.png",
 	},
-	
+
 	drawtype = "nodebox",
 	node_box = {
 		type = "fixed",
@@ -301,7 +299,7 @@ minetest.register_node("hyperloop:booking_ground", {
 			{ -8/16, -8/16, -3/16,  8/16,  8/16, 3/16},
 		},
 	},
-	
+
 	after_place_node = function(pos, placer, itemstack, pointed_thing)
 		naming_formspec(pos)
 	end,
@@ -309,8 +307,8 @@ minetest.register_node("hyperloop:booking_ground", {
 	on_receive_fields = on_receive_fields,
 	on_destruct = on_destruct,
 	on_rightclick = on_rightclick,
-	
-	on_rotate = screwdriver.disallow,	
+
+	on_rotate = screwdriver.disallow,
 	drop = "hyperloop:booking",
 	light_source = 2,
 	paramtype = 'light',
diff --git a/data_base.lua b/data_base.lua
index ba8e202..04710da 100644
--- a/data_base.lua
+++ b/data_base.lua
@@ -12,30 +12,12 @@
 ]]--
 
 -- for lazy programmers
-local S = function(pos) if pos then return minetest.pos_to_string(pos) end end
-local P = minetest.string_to_pos
-local M = minetest.get_meta
+--local P = minetest.string_to_pos
+--local M = minetest.get_meta
 
 hyperloop.Stations = hyperloop.Network:new()
 hyperloop.Elevators = hyperloop.Network:new()
 
-
--- Check all nodes on the map and delete useless data base entries
-local function check_data_base()
-	-- used for VM get_node
-	local tube = tubelib2.Tube:new({})
-	
-	hyperloop.Stations:filter(function(pos) 
-		local _,node = tube:get_node(pos)
-		return node.name == "hyperloop:station" or node.name == "hyperloop:junction"	
-	end)
-
-	hyperloop.Elevators:filter(function(pos) 
-		local _,node = tube:get_node(pos)
-		return node.name == "hyperloop:elevator_bottom"	
-	end)
-end	
-
 local storage = minetest.get_mod_storage()
 hyperloop.Stations:deserialize(storage:get_string("Stations"))
 hyperloop.Elevators:deserialize(storage:get_string("Elevators"))
diff --git a/deco.lua b/deco.lua
index 28e7898..9749858 100644
--- a/deco.lua
+++ b/deco.lua
@@ -15,20 +15,19 @@
 
 -- Load support for intllib.
 local S = hyperloop.S
-local NS = hyperloop.NS
 
 local tilesL = {"hyperloop_alpsL.png", "hyperloop_seaL.png", "hyperloop_agyptL.png"}
 local tilesR = {"hyperloop_alpsR.png", "hyperloop_seaR.png", "hyperloop_agyptR.png"}
 
 -- determine facedir and pos on the right hand side from the given pos
-function right_hand_side(pos, placer)
+local function right_hand_side(pos, placer)
 	local facedir = hyperloop.get_facedir(placer)
 	pos = hyperloop.new_pos(pos, facedir, "1R", 0)
 	return facedir,pos
 end
 
 for idx = 1,3 do
-	
+
 	minetest.register_node("hyperloop:poster"..idx.."L", {
 		description = S("Hyperloop Promo Poster ")..idx,
 		tiles = {
@@ -51,7 +50,7 @@ for idx = 1,3 do
 			type = "fixed",
 			fixed = { -8/16, -8/16, -6/16,  24/16,  8/16, 8/16},
 		},
-		
+
 		after_place_node = function(pos, placer)
 			local meta = minetest.get_meta(pos)
 			local facedir
@@ -69,8 +68,8 @@ for idx = 1,3 do
 				minetest.remove_node(pos)
 			end
 		end,
-		
-		
+
+
 		paramtype2 = "facedir",
 		light_source = 4,
 		is_ground_content = false,
@@ -133,7 +132,7 @@ minetest.register_node("hyperloop:signR", {
 			{ -8/16, -5/16, 6/16,  8/16,  5/16, 8/16},
 		},
 	},
-	
+
 	after_place_node = function(pos, placer, itemstack, pointed_thing)
 		pos.y = pos.y - 1
 		if minetest.get_node_or_nil(pos).name ~= "air" then
@@ -144,7 +143,7 @@ minetest.register_node("hyperloop:signR", {
 			minetest.swap_node(pos, node)
 		end
 	end,
-	
+
 	paramtype2 = "facedir",
 	paramtype = 'light',
 	light_source = 4,
@@ -170,7 +169,7 @@ minetest.register_node("hyperloop:signL", {
 			{ -8/16, -5/16, 6/16,  8/16,  5/16, 8/16},
 		},
 	},
-		
+
 	after_place_node = function(pos, placer, itemstack, pointed_thing)
 		pos.y = pos.y - 1
 		if minetest.get_node_or_nil(pos).name ~= "air" then
@@ -181,7 +180,7 @@ minetest.register_node("hyperloop:signL", {
 			minetest.swap_node(pos, node)
 		end
 	end,
-	
+
 	paramtype2 = "facedir",
 	paramtype = 'light',
 	light_source = 4,
diff --git a/door.lua b/door.lua
index e21154d..b4f2dcf 100644
--- a/door.lua
+++ b/door.lua
@@ -11,13 +11,12 @@
 ]]--
 
 -- for lazy programmers
-local SP = function(pos) if pos then return minetest.pos_to_string(pos) end end
-local P = minetest.string_to_pos
+--local SP = function(pos) if pos then return minetest.pos_to_string(pos) end end
+--local P = minetest.string_to_pos
 local M = minetest.get_meta
 
 --- Load support for intllib.
 local S = hyperloop.S
-local NS = hyperloop.NS
 
 -- Open the door for an emergency
 local function door_on_punch(pos, node, puncher, pointed_thing)
@@ -40,7 +39,6 @@ local function door_command(door_pos1, facedir, cmnd)
 
 	local node1 = minetest.get_node(door_pos1)
 	local node2 = minetest.get_node(door_pos2)
-	local meta = minetest.get_meta(door_pos1)
 	if cmnd == "open" then
 		minetest.sound_play("door", {
 				pos = door_pos1,
@@ -116,15 +114,15 @@ minetest.register_node("hyperloop:doorTopPassive", {
 		type = "fixed",
 		fixed = {-8/16, -8/16, -5/16, 8/16, 8/16, 5/16},
 	},
-	
+
 	on_punch = door_on_punch,
-	
+
 	auto_place_node = function(pos, facedir, sStationPos)
 		M(pos):set_int("facedir", facedir)
 		M(pos):set_string("sStationPos", sStationPos)
 	end,
-	
-	on_rotate = screwdriver.disallow,	
+
+	on_rotate = screwdriver.disallow,
 	paramtype = 'light',
 	light_source = 1,
 	paramtype2 = "facedir",
@@ -158,8 +156,8 @@ minetest.register_node("hyperloop:doorTopActive", {
 		type = "fixed",
 		fixed = {-8/16, -8/16, -5/16, 8/16, 8/16, 5/16},
 	},
-	
-	on_rotate = screwdriver.disallow,	
+
+	on_rotate = screwdriver.disallow,
 	paramtype2 = "facedir",
 	drop = "",
 	light_source = 2,
@@ -184,15 +182,15 @@ minetest.register_node("hyperloop:doorBottom", {
 		type = "fixed",
 		fixed = {-8/16, -8/16, -5/16, 8/16, 8/16, 5/16},
 	},
-	
+
 	on_punch = door_on_punch,
-	
+
 	auto_place_node = function(pos, facedir, sStationPos)
 		M(pos):set_int("facedir", facedir)
 		M(pos):set_string("sStationPos", sStationPos)
 	end,
-	
-	on_rotate = screwdriver.disallow,	
+
+	on_rotate = screwdriver.disallow,
 	paramtype = 'light',
 	light_source = 1,
 	paramtype2 = "facedir",
diff --git a/elevator.lua b/elevator.lua
index 719fe3d..43919c2 100644
--- a/elevator.lua
+++ b/elevator.lua
@@ -17,7 +17,6 @@ local M = minetest.get_meta
 
 -- Load support for intllib.
 local S = hyperloop.S
-local NS = hyperloop.NS
 
 -- To store elevator floors and formspecs
 local Cache = {}
@@ -36,9 +35,9 @@ end
 
 local Shaft = tubelib2.Tube:new({
 	dirs_to_check = dirs_to_check,
-	max_tube_length = 1000, 
+	max_tube_length = 1000,
 	show_infotext = true,
-	primary_node_names = {"hyperloop:shaft", "hyperloop:shaft2", "hyperloop:shaftA", "hyperloop:shaftA2"}, 
+	primary_node_names = {"hyperloop:shaft", "hyperloop:shaft2", "hyperloop:shaftA", "hyperloop:shaftA2"},
 	secondary_node_names = {"hyperloop:elevator_bottom", "hyperloop:elevator_top"},
 	after_place_tube = function(pos, param2, tube_type, num_tubes)
 		if tube_type == "S" then
@@ -65,8 +64,8 @@ Shaft:register_on_tube_update(function(node, pos, out_dir, peer_pos, peer_in_dir
 		-- switch to elevator_bottom node
 		pos = Shaft:get_pos(pos, 5)
 	elseif peer_pos then
-		local _,node = Shaft:get_node(peer_pos)
-		if node.name == "hyperloop:elevator_top" then
+		local _,node1 = Shaft:get_node(peer_pos)
+		if node1.name == "hyperloop:elevator_top" then
 			peer_pos = Shaft:get_pos(peer_pos, 5)
 		end
 	end
@@ -108,11 +107,11 @@ minetest.register_node("hyperloop:shaft", {
 		end
 		return false
 	end,
-	
+
 	after_dig_node = function(pos, oldnode, oldmetadata, digger)
 		Shaft:after_dig_tube(pos, oldnode, oldmetadata)
 	end,
-	
+
 	climbable = true,
 	paramtype2 = "facedir",
 	on_rotate = screwdriver.disallow,
@@ -158,11 +157,11 @@ minetest.register_node("hyperloop:shaftA", {
 		end
 		return false
 	end,
-	
+
 	after_dig_node = function(pos, oldnode, oldmetadata, digger)
 		Shaft:after_dig_tube(pos, oldnode, oldmetadata)
 	end,
-	
+
 	climbable = true,
 	paramtype2 = "facedir",
 	on_rotate = screwdriver.disallow,
@@ -204,7 +203,7 @@ minetest.register_node("hyperloop:shaft2", {
 	after_dig_node = function(pos, oldnode, oldmetadata, digger)
 		Shaft:after_dig_tube(pos, oldnode, oldmetadata)
 	end,
-	
+
 	climbable = true,
 	paramtype2 = "facedir",
 	on_rotate = screwdriver.disallow,
@@ -251,7 +250,7 @@ minetest.register_node("hyperloop:shaftA2", {
 	after_dig_node = function(pos, oldnode, oldmetadata, digger)
 		Shaft:after_dig_tube(pos, oldnode, oldmetadata)
 	end,
-	
+
 	climbable = true,
 	paramtype2 = "facedir",
 	on_rotate = screwdriver.disallow,
@@ -332,13 +331,13 @@ local function door_command(floor_pos, facedir, cmnd, sound)
 	local door_pos1 = hyperloop.new_pos(floor_pos, facedir, "1B", 0)
 	local door_pos2 = hyperloop.new_pos(floor_pos, facedir, "1B", 1)
 	local meta = M(floor_pos)
-	local owner = meta:contains("owner") and meta:get_string("owner") 
+	local owner = meta:contains("owner") and meta:get_string("owner")
 	if owner and (minetest.is_protected(door_pos1, owner) or minetest.is_protected(door_pos2, owner)) then
 		return
 	end
 	local node1 = minetest.get_node(door_pos1)
 	local node2 = minetest.get_node(door_pos2)
-	
+
 	if sound then
 		minetest.sound_play("ele_door", {
 				pos = floor_pos,
@@ -445,7 +444,7 @@ minetest.register_node("hyperloop:elevator_bottom", {
 		fixed = { -8/16, -8/16, -8/16,   8/16, 23/16, 8/16 },
 	},
 	inventory_image = "hyperloop_elevator_inventory.png",
-	on_rotate = screwdriver.disallow,	
+	on_rotate = screwdriver.disallow,
 	drawtype = "nodebox",
 	paramtype = 'light',
 	light_source = 6,
@@ -458,25 +457,25 @@ minetest.register_node("hyperloop:elevator_bottom", {
 		if node.name == "air" then
 			local facedir = hyperloop.get_facedir(placer)
 			Elevators:set(pos, "<unknown>", {facedir=facedir, busy=false})
-			
+
 			Shaft:after_place_node(pos, {5})
-			
+
 			-- formspec
 			local meta = minetest.get_meta(pos)
-			local formspec = "size[6,4]"..
+			local fs = "size[6,4]"..
 			"label[0,0;"..S("Please insert floor name").."]" ..
 			"field[0.5,1.5;5,1;floor;"..S("Floor name")..";"..S("Base").."]" ..
 			"button_exit[2,3;2,1;exit;"..S("Save").."]"
-			meta:set_string("formspec", formspec)
+			meta:set_string("formspec", fs)
 			meta:set_string("owner", placer:get_player_name())
-			
+
 			-- add upper part of the car
 			pos = Shaft:get_pos(pos, 6)
 			minetest.add_node(pos, {name="hyperloop:elevator_top", param2=facedir})
 			Shaft:after_place_node(pos, {6})
 		else
 			minetest.remove_node(pos)
-			return true	
+			return true
 		end
 	end,
 
@@ -559,8 +558,8 @@ minetest.register_node("hyperloop:elevator_top", {
 			{ -7/16, -8/16,  7/16,   7/16,  8/16, 8/16},
 		},
 	},
-	
-	on_rotate = screwdriver.disallow,	
+
+	on_rotate = screwdriver.disallow,
 	drawtype = "nodebox",
 	paramtype = 'light',
 	light_source = 6,
@@ -584,8 +583,8 @@ minetest.register_node("hyperloop:elevator_door_top", {
 			{ -8/16, -8/16,  7/16,   8/16,  8/16, 8/16},
 		},
 	},
-	
-	on_rotate = screwdriver.disallow,	
+
+	on_rotate = screwdriver.disallow,
 	drop = "",
 	paramtype = 'light',
 	paramtype2 = "facedir",
@@ -607,12 +606,12 @@ minetest.register_node("hyperloop:elevator_door", {
 			{ -8/16, -8/16,  7/16,   8/16,  8/16, 8/16},
 		},
 	},
-	
+
 	selection_box = {
 		type = "fixed",
 		fixed = { -8/16, -8/16, 6.5/16,   8/16, 24/16, 8/16 },
 	},
-	
+
 	on_rightclick = function(pos, node, clicker, itemstack, pointed_thing)
 		local floor_pos = P(M(pos):get_string("floor_pos"))
 		if floor_pos ~= nil then
@@ -623,8 +622,8 @@ minetest.register_node("hyperloop:elevator_door", {
 			end
 		end
 	end,
-	
-	on_rotate = screwdriver.disallow,	
+
+	on_rotate = screwdriver.disallow,
 	drop = "",
 	paramtype = 'light',
 	paramtype2 = "facedir",
@@ -646,8 +645,8 @@ minetest.register_node("hyperloop:elevator_door_dark_top", {
 			{ -8/16, -8/16,  7/16,   8/16,  8/16, 8/16},
 		},
 	},
-	
-	on_rotate = screwdriver.disallow,	
+
+	on_rotate = screwdriver.disallow,
 	drop = "",
 	paramtype = 'light',
 	paramtype2 = "facedir",
@@ -668,13 +667,13 @@ minetest.register_node("hyperloop:elevator_door_dark", {
 			{ -8/16, -8/16,  7/16,   8/16,  8/16, 8/16},
 		},
 	},
-	
+
 	selection_box = {
 		type = "fixed",
 		fixed = { -8/16, -8/16, 7/16,   8/16, 24/16, 8/16 },
 	},
-	
-	on_rotate = screwdriver.disallow,	
+
+	on_rotate = screwdriver.disallow,
 	drop = "",
 	paramtype = 'light',
 	paramtype2 = "facedir",
diff --git a/init.lua b/init.lua
index 80aefd9..8def590 100644
--- a/init.lua
+++ b/init.lua
@@ -34,8 +34,8 @@
 	2020-01-03  v2.04  Elevator door bugfix (MT 5+)
 	2020-03-12  v2.05  minetest translator added (thanks to acmgit/Clyde)
 	2020-06-14  v2.06  The default value for `hyperloop_free_tube_placement_enabled` is now true
-        2021-02-07  v2.07  tube_crowbar: Add tube length check
-        2021-11-01  v2.08  Enable the use of hyperloop networks for other mods
+	2021-02-07  v2.07  tube_crowbar: Add tube length check
+	2021-11-01  v2.08  Enable the use of hyperloop networks for other mods
 
 ]]--
 
diff --git a/junction.lua b/junction.lua
index f504521..823ec40 100644
--- a/junction.lua
+++ b/junction.lua
@@ -11,13 +11,12 @@
 ]]--
 
 -- for lazy programmers
-local SP = function(pos) if pos then return minetest.pos_to_string(pos) end end
-local P = minetest.string_to_pos
+--local SP = function(pos) if pos then return minetest.pos_to_string(pos) end end
+--local P = minetest.string_to_pos
 local M = minetest.get_meta
 
 -- Load support for intllib.
 local S = hyperloop.S
-local NS = hyperloop.NS
 
 local Tube = hyperloop.Tube
 local Stations = hyperloop.Stations
@@ -63,7 +62,7 @@ minetest.register_node("hyperloop:junction", {
 		Tube:after_dig_node(pos)
 		Stations:delete(pos)
 	end,
-	
+
 	paramtype2 = "facedir",
 	on_rotate = screwdriver.disallow,
 	paramtype = "light",
diff --git a/lcd.lua b/lcd.lua
index 81308c4..3177a54 100644
--- a/lcd.lua
+++ b/lcd.lua
@@ -1,8 +1,8 @@
 --[[
 
-	LCD 
+	LCD
 	===
-	
+
 	Derived from the work of kaeza, sofar and others (digilines)
 
 	LGPLv2.1+
@@ -12,8 +12,6 @@
 
 -- Load support for intllib.
 local S = hyperloop.S
-local NS = hyperloop.NS
-
 
 -- load characters map
 local chars_file = io.open(minetest.get_modpath("hyperloop").."/characters.data", "r")
@@ -161,7 +159,7 @@ minetest.register_node("hyperloop:lcd", {
 	description = S("Hyperloop Display"),
 	tiles = {"hyperloop_lcd.png"},
 
-	on_rotate = screwdriver.disallow,	
+	on_rotate = screwdriver.disallow,
 	paramtype = "light",
 	sunlight_propagates = true,
 	paramtype2 = "wallmounted",
@@ -185,7 +183,7 @@ minetest.register_node("hyperloop:lcd", {
 	update = function(pos, text)
 		lcd_update(pos, text)
 	end,
-	
+
 	light_source = 6,
 })
 
diff --git a/map.lua b/map.lua
index 9c292e6..6ddbf4c 100644
--- a/map.lua
+++ b/map.lua
@@ -12,12 +12,11 @@
 
 -- for lazy programmers
 local SP = function(pos) if pos then return minetest.pos_to_string(pos) end end
-local P = minetest.string_to_pos
-local M = minetest.get_meta
+--local P = minetest.string_to_pos
+--local M = minetest.get_meta
 
 -- Load support for intllib.
 local S = hyperloop.S
-local NS = hyperloop.NS
 
 local Stations = hyperloop.Stations
 
@@ -30,7 +29,7 @@ local function generate_string(sortedList)
 		local sKey = SP(item.pos)
 		lStationPositions[sKey] = idx
 	end
-	
+
 	local tRes = {
 		"label[0,0;ID]"..
 		"label[0.7,0;"..S("Dist.").."]"..
@@ -46,7 +45,7 @@ local function generate_string(sortedList)
 		local owner = dataSet.owner or "<unknown>"
 		local name = dataSet.name or "<unknown>"
 		local distance = dataSet.distance or 0
-		
+
 		tRes[#tRes+1] = "label[0,"..ypos..";"..idx.."]"
 		tRes[#tRes+1] = "label[0.7,"..ypos..";"..distance.." m]"
 		tRes[#tRes+1] = "label[1.8,"..ypos..";"..string.sub(name,1,24).."]"
@@ -87,7 +86,7 @@ local function map_on_use(itemstack, user)
 	local player_name = user:get_player_name()
 	local pos = user:get_pos()
 	local sStationList = station_list_as_string(pos)
-	local formspec = "size[12,10]" .. 
+	local formspec = "size[12,10]" ..
 	default.gui_bg..
 	default.gui_bg_img..
 	default.gui_slots..
@@ -102,7 +101,7 @@ local function map_on_secondary_use(itemstack, user)
 	local player_name = user:get_player_name()
 	local pos = user:get_pos()
 	local sStationList = network_list_as_string(pos)
-	local formspec = "size[12,10]" .. 
+	local formspec = "size[12,10]" ..
 	default.gui_bg..
 	default.gui_bg_img..
 	default.gui_slots..
diff --git a/migrate.lua b/migrate.lua
index e438e79..c41e51c 100644
--- a/migrate.lua
+++ b/migrate.lua
@@ -12,7 +12,7 @@
 	see init.lua
 
 	Migrate from v1 to v2
-	
+
 ]]--
 
 -- for lazy programmers
@@ -22,7 +22,6 @@ local M = minetest.get_meta
 
 -- Load support for intllib.
 local S = hyperloop.S
-local NS = hyperloop.NS
 
 local Tube = hyperloop.Tube
 local Shaft = hyperloop.Shaft
@@ -37,12 +36,12 @@ local JunctionsToBePlacedAfter = {}
 local function get_tube_data(pos, dir1, dir2, num_tubes)
 	local param2, tube_type = tubelib2.encode_param2(dir1, dir2, num_tubes)
 	return pos, param2, tube_type, num_tubes
-end	
+end
 
 -- Check if node has a connection on the given dir
 local function connected(self, pos, dir)
 	local _,node = self:get_node(pos, dir)
-	return self.primary_node_names[node.name] 
+	return self.primary_node_names[node.name]
 		or self.secondary_node_names[node.name]
 end
 
@@ -100,7 +99,7 @@ local function convert_legary_nodes(self, pos, dir)
 		if tLegacyNodeNames[node.name]  then
 			local dir1, dir2, num = determine_dir1_dir2_and_num_conn(self, npos)
 			if dir1 then
-				self.clbk_after_place_tube(get_tube_data(npos, dir1, 
+				self.clbk_after_place_tube(get_tube_data(npos, dir1,
 					dir2 or tubelib2.Turn180Deg[dir1], num))
 				if tubelib2.Turn180Deg[dir] == dir1 then
 					return npos, dir2
@@ -110,9 +109,9 @@ local function convert_legary_nodes(self, pos, dir)
 			end
 		end
 	end
-	
+
 	local cnt = 0
-	if not dir then	return pos, dir, cnt end	
+	if not dir then	return pos, dir, cnt end
 	while cnt <= 64000 do
 		local new_pos, new_dir = convert_next_tube(self, pos, dir)
 		if cnt > 0 and (cnt % self.max_tube_length) == 0 then -- border reached?
@@ -123,11 +122,11 @@ local function convert_legary_nodes(self, pos, dir)
 		cnt = cnt + 1
 	end
 	return pos, dir, cnt
-end	
+end
 
 local function convert_line(self, pos, dir)
-	local fpos,fdir = convert_legary_nodes(self, pos, dir)
-	self:tool_repair_tube(pos)	
+	convert_legary_nodes(self, pos, dir)
+	self:tool_repair_tube(pos)
 end
 
 
@@ -135,12 +134,12 @@ local tWifiNodes = {}  -- user for pairing
 local lWifiNodes = {}  -- used for post processing
 
 local function set_pairing(pos, peer_pos)
-	
+
 	M(pos):set_int("tube_dir", Tube:get_primary_dir(pos))
 	M(peer_pos):set_int("tube_dir", Tube:get_primary_dir(peer_pos))
-	
-	local tube_dir1 = Tube:store_teleport_data(pos, peer_pos)
-	local tube_dir2 = Tube:store_teleport_data(peer_pos, pos)
+
+	Tube:store_teleport_data(pos, peer_pos)
+	Tube:store_teleport_data(peer_pos, pos)
 end
 
 
@@ -195,8 +194,8 @@ end
 
 local function search_wifi_node(pos, dir)
 	local convert_next_tube = function(pos, dir)
-		local npos, node = Tube:get_node(pos, dir)
-		local dir1, dir2, num = next_node_on_the_way_to_a_wifi_node(npos)
+		local npos, _ = Tube:get_node(pos, dir)
+		local dir1, dir2, _ = next_node_on_the_way_to_a_wifi_node(npos)
 		if dir1 then
 			if tubelib2.Turn180Deg[dir] == dir1 then
 				return npos, dir2
@@ -205,9 +204,9 @@ local function search_wifi_node(pos, dir)
 			end
 		end
 	end
-	
+
 	local cnt = 0
-	if not dir then	return pos, cnt end	
+	if not dir then	return pos, cnt end
 	while true do
 		local new_pos, new_dir = convert_next_tube(pos, dir)
 		if not new_dir then	break end
@@ -215,12 +214,12 @@ local function search_wifi_node(pos, dir)
 		cnt = cnt + 1
 	end
 	return pos, dir, cnt
-end	
+end
 
 local function search_wifi_node_in_all_dirs(pos)
 	-- check all positions
 	for dir = 1, 6 do
-		local npos, node = Tube:get_node(pos, dir)
+		local _, node = Tube:get_node(pos, dir)
 		if node and node.name == "hyperloop:tube1" then
 			search_wifi_node(pos, dir)
 		end
@@ -230,7 +229,7 @@ end
 local function convert_tube_line(pos)
 	-- check all positions
 	for dir = 1, 6 do
-		local npos, node = Tube:get_node(pos, dir)
+		local _, node = Tube:get_node(pos, dir)
 		if node and node.name == "hyperloop:tube1" then
 			convert_line(Tube, pos, dir)
 		end
@@ -266,13 +265,13 @@ end
 
 local function convert_station_data(tAllStations)
 	tLegacyNodeNames = {
-		["hyperloop:tube0"] = true, 
-		["hyperloop:tube1"] = true, 
-		["hyperloop:tube2"] = true, 
+		["hyperloop:tube0"] = true,
+		["hyperloop:tube1"] = true,
+		["hyperloop:tube2"] = true,
 	}
-	
+
 	local originNodeNames = add_to_table(Tube.primary_node_names, tLegacyNodeNames)
-	
+
 	for key,item in pairs(tAllStations) do
 		if item.pos and Tube:is_secondary_node(item.pos) then
 			Stations:set(item.pos, station_name(item), {
@@ -301,19 +300,19 @@ local function convert_station_data(tAllStations)
 	end
 	-- Repair the tube lines of wifi nodes
 	wifi_post_processing()
-	
+
 	Tube.primary_node_names = originNodeNames
 end
 
 local function convert_elevator_data(tAllElevators)
 	tLegacyNodeNames = {
-		["hyperloop:shaft"] = true, 
+		["hyperloop:shaft"] = true,
 		["hyperloop:shaft2"] = true,
 	}
 	local originNodeNames = add_to_table(Shaft.primary_node_names, tLegacyNodeNames)
 	local originDirsToCheck = table.copy(Shaft.dirs_to_check)
 	Shaft.dirs_to_check = {5,6}  -- legacy elevators use up/down only
-	
+
 	for pos,tElevator in pairs(tAllElevators) do
 		for _,floor in pairs(tElevator.floors) do
 			if floor.pos and Shaft:is_secondary_node(floor.pos) then
@@ -326,7 +325,7 @@ local function convert_elevator_data(tAllElevators)
 			end
 		end
 	end
-	
+
 	Shaft.primary_node_names = originNodeNames
 	Shaft.dirs_to_check = originDirsToCheck
 end
diff --git a/network.lua b/network.lua
index aaa9659..ac67d64 100644
--- a/network.lua
+++ b/network.lua
@@ -14,26 +14,26 @@
 -- for lazy programmers
 local S = function(pos) if pos then return minetest.pos_to_string(pos) end end
 local P = minetest.string_to_pos
-local M = minetest.get_meta
+--local M = minetest.get_meta
 
 -- Convert to list and add pos based on key string
 local function table_to_list(table)
 	local lRes = {}
-	for key,item in pairs(table) do 
+	for key,item in pairs(table) do
 		item.pos = P(key)
-		lRes[#lRes+1] = item 
+		lRes[#lRes+1] = item
 	end
 	return lRes
 end
 
 local function distance(pos1, pos2)
-	return math.floor(math.abs(pos1.x - pos2.x) + 
+	return math.floor(math.abs(pos1.x - pos2.x) +
 			math.abs(pos1.y - pos2.y) + math.abs(pos1.z - pos2.z))
 end
 
 -- Add the distance to pos to each list item
 local function add_distance_to_list(lStations, pos)
-	for _,item in ipairs(lStations) do 
+	for _,item in ipairs(lStations) do
 		item.distance = distance(item.pos, pos)
 	end
 	return lStations
@@ -50,7 +50,7 @@ local function add_index_to_list(lStations)
 			end
 		end
 	end
-	
+
 	local key = nil
 	for idx = 1,#lStations do
 		key = get_next(key, idx)
@@ -61,8 +61,8 @@ end
 -- Return a table with all stations, the given station (as 'sKey') is connected with
 -- tRes is used for the resulting table (recursive call)
 local function get_stations(tStations, sKey, tRes)
-	if not tStations[sKey] or not tStations[sKey].conn then 
-		return {} 
+	if not tStations[sKey] or not tStations[sKey].conn then
+		return {}
 	end
 	for dir,dest in pairs(tStations[sKey].conn) do
 		-- Not already visited?
@@ -87,7 +87,7 @@ local function sort_based_on_level(tStations)
 	table.sort(lStations, function(a,b) return (a.idx or 9999) < (b.idx or 9999) end)
 	return lStations
 end
-	
+
 -- Return a list with sorted stations
 local function sort_based_on_distance(tStations, pos)
 	local lStations = table_to_list(table.copy(tStations))
@@ -100,7 +100,7 @@ end
 -- Return a list with sorted stations
 local function sort_based_on_name(tStations, pos)
 	local lStations = table_to_list(table.copy(tStations))
-	-- Add distance 
+	-- Add distance
 	lStations = add_distance_to_list(lStations, pos)
 	table.sort(lStations, function(a,b) return a.name < b.name end)
 	return lStations
@@ -185,7 +185,7 @@ end
 function Network:changed(counter)
 	return self.change_counter > counter, self.change_counter
 end
-	
+
 -- Update the connection data base. The output dir information is needed
 -- to be able to delete a connection, if necessary.
 -- Returns true, if data base is changed.
@@ -273,16 +273,16 @@ function Network:deserialize(data)
 		self.change_counter = data.change_counter
 	end
 end
-	
+
 function Network:serialize()
 	return minetest.serialize(self)
 end
-	
+
 -- Return a pos/item table with all network nodes, the node at pos is connected with
 function Network:get_node_table(pos)
 	local tRes = {}
 	local key = S(pos)
-	get_stations(self.tStations, key, tRes)	
+	get_stations(self.tStations, key, tRes)
 	tRes[key] = nil
 	return tRes
 end
diff --git a/recipes.lua b/recipes.lua
index b0b1ebf..a8e62b0 100644
--- a/recipes.lua
+++ b/recipes.lua
@@ -15,7 +15,6 @@
 
 -- Load support for intllib.
 local S = hyperloop.S
-local NS = hyperloop.NS
 
 minetest.register_craftitem("hyperloop:hypersteel_ingot", {
 	description = S("Hypersteel Ingot"),
diff --git a/seat.lua b/seat.lua
index 2c28777..a228af5 100644
--- a/seat.lua
+++ b/seat.lua
@@ -11,16 +11,14 @@
 ]]--
 
 -- for lazy programmers
-local SP = function(pos) if pos then return minetest.pos_to_string(pos) end end
-local P = minetest.string_to_pos
+--local SP = function(pos) if pos then return minetest.pos_to_string(pos) end end
+--local P = minetest.string_to_pos
 local M = minetest.get_meta
 
 -- Load support for intllib.
 local S = hyperloop.S
-local NS = hyperloop.NS
 local I, _ = dofile( minetest.get_modpath("hyperloop").."/intllib.lua")
 
-local Stations = hyperloop.Stations
 local PlayerNameTags = {}
 
 local function enter_display(tStation, text)
@@ -28,7 +26,7 @@ local function enter_display(tStation, text)
 	if tStation ~= nil then
 		local lcd_pos = hyperloop.new_pos(tStation.pos, tStation.facedir, "1F", 2)
 		-- update display
-		minetest.registered_nodes["hyperloop:lcd"].update(lcd_pos, text) 
+		minetest.registered_nodes["hyperloop:lcd"].update(lcd_pos, text)
 	end
 end
 
@@ -149,13 +147,13 @@ local function on_start_travel(pos, node, clicker)
 	if tDeparture == nil or tArrival == nil then
 		return
 	end
-	
+
 	minetest.sound_play("up2", {
 			pos = pos,
 			gain = 0.5,
 			max_hear_distance = 2
 		})
-	
+
 	-- close the door at arrival station
 	hyperloop.close_pod_door(tArrival)
 	-- place player on the seat
@@ -166,9 +164,9 @@ local function on_start_travel(pos, node, clicker)
 	-- hide player name
 	PlayerNameTags[player_name] = clicker:get_nametag_attributes()
 	clicker:set_nametag_attributes({text = "     "})
-	
+
 	-- activate display
-	local dist = hyperloop.distance(pos, tArrival.pos) 
+	local dist = hyperloop.distance(pos, tArrival.pos)
 	local text = I("Destination:").." | "..string.sub(tArrival.name, 1, 13).." | "..I("Distance:").." | "..
 				 meter_to_km(dist).." | "..I("Arrival in:").." | "
 	local atime
@@ -182,7 +180,7 @@ local function on_start_travel(pos, node, clicker)
 	enter_display(tDeparture, text..atime.." sec")
 
 	-- block departure and arrival stations
-	hyperloop.block(departure_pos, arrival_pos, atime+10)	
+	hyperloop.block(departure_pos, arrival_pos, atime+10)
 
 	-- store some data for on_timer()
 	meta:set_int("arrival_time", atime)
@@ -207,7 +205,7 @@ minetest.register_node("hyperloop:seat", {
 	},
 	drawtype = "nodebox",
 	paramtype = 'light',
-	light_source = 1,	
+	light_source = 1,
 	paramtype2 = "facedir",
 	is_ground_content = false,
 	walkable = false,
@@ -229,8 +227,8 @@ minetest.register_node("hyperloop:seat", {
 
 	on_timer = display_timer,
 	on_rightclick = on_start_travel,
-	on_rotate = screwdriver.disallow,	
-	
+	on_rotate = screwdriver.disallow,
+
 	auto_place_node = function(pos, facedir, sStationPos)
 		M(pos):set_string("sStationPos", sStationPos)
 	end,
diff --git a/station.lua b/station.lua
index 10efae2..1d95031 100644
--- a/station.lua
+++ b/station.lua
@@ -12,12 +12,11 @@
 
 -- for lazy programmers
 local SP = function(pos) if pos then return minetest.pos_to_string(pos) end end
-local P = minetest.string_to_pos
+--local P = minetest.string_to_pos
 local M = minetest.get_meta
 
 -- Load support for intllib.
 local S = hyperloop.S
-local NS = hyperloop.NS
 
 local Tube = hyperloop.Tube
 local Stations = hyperloop.Stations
@@ -38,7 +37,7 @@ local AssemblyPlan = {
 	{ 0, "1F", 2, "hyperloop:seat"},
 	{ 0, "1F", 0, "hyperloop:pod_floor"},
 	{ 1, "",   0, "hyperloop:lcd"},
-	-- right slice	
+	-- right slice
 	{-1, "1F1R", 0, "hyperloop:pod_wall_ni"},
 	{ 1, "",   0, "hyperloop:pod_wall_ni"},
 	{ 1, "",   0, "hyperloop:pod_wall_ni"},
@@ -51,7 +50,7 @@ local AssemblyPlan = {
 	{ 0, "1F", 0, "hyperloop:pod_wall_ni"},
 	{ 1, "",   0, "hyperloop:pod_wall_ni"},
 	{ 0, "1B", 0, "hyperloop:pod_wall_ni"},
-	-- left slice	
+	-- left slice
 	{-1, "2L2R", 0, "hyperloop:pod_wall_ni"},
 	{ 1, "",   0, "hyperloop:pod_wall_ni"},
 	{ 1, "",   0, "hyperloop:pod_wall_ni"},
@@ -69,10 +68,10 @@ local AssemblyPlan = {
 
 local function store_station(pos, placer)
 	local facedir = hyperloop.get_facedir(placer)
-	-- do a facedir correction 
+	-- do a facedir correction
 	facedir = (facedir + 3) % 4  -- face to LCD
 	Stations:set(pos, "Station", {
-			owner = placer:get_player_name(), 
+			owner = placer:get_player_name(),
 			facedir = facedir,
 			time_blocked = 0})
 end
@@ -88,7 +87,7 @@ end
 local function place_node(pos, facedir, node_name, sKey)
 	if node_name == "hyperloop:lcd" then
 		-- wallmounted devices need a facedir correction
-		local tbl = {[0]=4, [1]=2, [2]=5, [3]=3} 
+		local tbl = {[0]=4, [1]=2, [2]=5, [3]=3}
 		minetest.add_node(pos, {name=node_name, paramtype2="wallmounted", param2=tbl[facedir]})
 	else
 		minetest.add_node(pos, {name=node_name, param2=facedir})
@@ -107,11 +106,11 @@ local function construct(idx, pos, facedir, player_name, sKey)
 	else
 		hyperloop.chat(player_name, S("Station completed. Now place the Booking Machine!"))
 	end
-end	
-	
+end
+
 local function check_space(pos, facedir, placer)
 	for _,item in ipairs(AssemblyPlan) do
-		local y, path, node_name = item[1], item[2], item[4]
+		local y, path, _ = item[1], item[2], item[4]
 		pos = hyperloop.new_pos(pos, facedir, path, y)
 		if minetest.is_protected(pos, placer:get_player_name()) then
 			hyperloop.chat(placer, S("Area is protected!"))
@@ -169,7 +168,7 @@ local function check_inventory(inv, player)
 	hyperloop.chat(player, S("Not enough inventory items to build the station!"))
 	return false
 end
-	
+
 local function remove_inventory_items(inv, meta)
 	inv:remove_item("src", ItemStack("hyperloop:pod_wall 30"))
 	inv:remove_item("src", ItemStack("hyperloop:hypersteel_ingot 4"))
@@ -189,18 +188,18 @@ local function build_station(pos, placer)
 	-- check protection
 	if minetest.is_protected(pos, placer:get_player_name()) then
 		return
-	end			
+	end
 	local meta = M(pos)
 	local inv = meta:get_inventory()
 	local facedir = hyperloop.get_facedir(placer)
-	-- do a facedir correction 
+	-- do a facedir correction
 	facedir = (facedir + 3) % 4				-- face to LCD
 	if check_inventory(inv, placer) then
 		Stations:update(pos, {facedir = facedir})
 
 		if check_space(table.copy(pos), facedir, placer) then
 			construct(1, table.copy(pos), facedir, placer:get_player_name(), SP(pos))
-			meta:set_string("formspec", station_formspec .. 
+			meta:set_string("formspec", station_formspec ..
 				"button_exit[0,3.9;3,1;destroy;"..S("Destroy Station").."]")
 			meta:set_int("built", 1)
 			meta:set_int("busy", 1)
@@ -222,21 +221,21 @@ local function destroy_station(pos, player_name)
 	-- check protection
 	if minetest.is_protected(pos, player_name) then
 		return
-	end		
-	
+	end
+
 	local station = Stations:get(pos)
 	if station then
 		-- remove nodes
 		local _pos = table.copy(pos)
 		for _,item in ipairs(AssemblyPlan) do
-			local y, path, node_name = item[1], item[2], item[4]
+			local y, path, _ = item[1], item[2], item[4]
 			_pos = hyperloop.new_pos(_pos, station.facedir, path, y)
 			minetest.remove_node(_pos)
 		end
 		on_destruct(pos)
 		-- maintain meta
 		local meta = M(pos)
-		meta:set_string("formspec", station_formspec .. 
+		meta:set_string("formspec", station_formspec ..
 			"button_exit[0,3.9;3,1;build;"..S("Build Station").."]")
 		local inv = meta:get_inventory()
 		add_inventory_items(inv)
@@ -257,12 +256,12 @@ minetest.register_node("hyperloop:station", {
 
 	on_construct = function(pos)
 		local meta = M(pos)
-		meta:set_string("formspec", station_formspec .. 
+		meta:set_string("formspec", station_formspec ..
 			"button_exit[0,3.9;3,1;build;"..S("Build Station").."]")
 		local inv = meta:get_inventory()
 		inv:set_size('src', 4)
 	end,
-	
+
 	after_place_node = function(pos, placer, itemstack, pointed_thing)
 		hyperloop.check_network_level(pos, placer)
 		M(pos):set_string("infotext", S("Station"))
@@ -280,7 +279,7 @@ minetest.register_node("hyperloop:station", {
 			build_station(pos, player)
 		end
 	end,
-	
+
 	on_dig = function(pos, node, puncher, pointed_thing)
 		local meta = minetest.get_meta(pos)
 		local inv = meta:get_inventory()
@@ -288,13 +287,13 @@ minetest.register_node("hyperloop:station", {
 			minetest.node_dig(pos, node, puncher, pointed_thing)
 		end
 	end,
-	
+
 	after_dig_node = function(pos, oldnode, oldmetadata, digger)
 		Tube:after_dig_node(pos)
 		Stations:delete(pos)
 	end,
-		
-	on_rotate = screwdriver.disallow,	
+
+	on_rotate = screwdriver.disallow,
 	paramtype2 = "facedir",
 	groups = {cracky = 1},
 	is_ground_content = false,
@@ -309,7 +308,7 @@ minetest.register_node("hyperloop:pod_wall", {
 		"hyperloop_skin2.png",
 		"hyperloop_skin.png",
 	},
-	on_rotate = screwdriver.disallow,	
+	on_rotate = screwdriver.disallow,
 	paramtype2 = "facedir",
 	groups = {cracky=2},
 	is_ground_content = false,
@@ -324,7 +323,7 @@ minetest.register_node("hyperloop:pod_wall_ni", {
 		"hyperloop_skin2.png",
 		"hyperloop_skin.png",
 	},
-	on_rotate = screwdriver.disallow,	
+	on_rotate = screwdriver.disallow,
 	paramtype2 = "facedir",
 	groups = {cracky=2, not_in_creative_inventory=1},
 	is_ground_content = false,
@@ -345,7 +344,7 @@ minetest.register_node("hyperloop:pod_floor", {
 			{-8/16, -8/16, -8/16, 8/16,  -7.5/16,  8/16},
 		},
 	},
-	on_rotate = screwdriver.disallow,	
+	on_rotate = screwdriver.disallow,
 	paramtype2 = "facedir",
 	groups = {cracky=2, not_in_creative_inventory=1},
 	is_ground_content = false,
diff --git a/tube.lua b/tube.lua
index b1ad8b5..c3429ac 100644
--- a/tube.lua
+++ b/tube.lua
@@ -11,27 +11,11 @@
 ]]--
 
 -- for lazy programmers
-local S = function(pos) if pos then return minetest.pos_to_string(pos) end end
 local P = minetest.string_to_pos
-local M = minetest.get_meta
+--local M = minetest.get_meta
 
 -- Load support for intllib.
 local S = hyperloop.S
-local NS = hyperloop.NS
-
-local function station_name(pos)
-	local dataSet = hyperloop.get_station(pos)
-	if dataSet then
-		if dataSet.junction == true then
-			return S("Junction at ")..SP(pos)
-		elseif dataSet.name ~= nil then
-			return S("Station '")..dataSet.name.."' at "..SP(pos)
-		else
-			return S("Station at ")..SP(pos)
-		end
-	end
-	return S("Open end at ")..minetest.pos_to_string(pos)
-end
 
 function hyperloop.check_network_level(pos, player)
 	if hyperloop.free_tube_placement_enabled then
@@ -54,9 +38,9 @@ end
 
 local Tube = tubelib2.Tube:new({
 	dirs_to_check = dirs_to_check,
-	max_tube_length = 1000, 
+	max_tube_length = 1000,
 	show_infotext = true,
-	primary_node_names = {"hyperloop:tubeS", "hyperloop:tubeS2", "hyperloop:tubeA", "hyperloop:tubeA2"}, 
+	primary_node_names = {"hyperloop:tubeS", "hyperloop:tubeS2", "hyperloop:tubeA", "hyperloop:tubeA2"},
 	secondary_node_names = {"hyperloop:junction", "hyperloop:station", "hyperloop:tube_wifi1"},
 	after_place_tube = function(pos, param2, tube_type, num_tubes)
 		if num_tubes == 2 then
@@ -71,7 +55,7 @@ hyperloop.Tube = Tube
 
 minetest.register_node("hyperloop:tubeS", {
 	description = S("Hyperloop Tube"),
-	inventory_image = minetest.inventorycube("hyperloop_tube_locked.png", 
+	inventory_image = minetest.inventorycube("hyperloop_tube_locked.png",
 		'hyperloop_tube_open.png', "hyperloop_tube_locked.png"),
 	tiles = {
 		-- up, down, right, left, back, front
@@ -113,11 +97,11 @@ minetest.register_node("hyperloop:tubeS", {
 		end
 		return false
 	end,
-	
+
 	after_dig_node = function(pos, oldnode, oldmetadata, digger)
 		Tube:after_dig_tube(pos, oldnode, oldmetadata)
 	end,
-	
+
 	paramtype2 = "facedir", -- important!
 	on_rotate = screwdriver.disallow, -- important!
 	paramtype = "light",
@@ -166,7 +150,7 @@ minetest.register_node("hyperloop:tubeS2", {
 	after_dig_node = function(pos, oldnode, oldmetadata, digger)
 		Tube:after_dig_tube(pos, oldnode, oldmetadata)
 	end,
-	
+
 	paramtype2 = "facedir", -- important!
 	on_rotate = screwdriver.disallow, -- important!
 	paramtype = "light",
@@ -184,7 +168,7 @@ minetest.register_node("hyperloop:tubeS2", {
 
 minetest.register_node("hyperloop:tubeA", {
 	description = S("Hyperloop Tube"),
-	inventory_image = minetest.inventorycube("hyperloop_tube_locked.png", 
+	inventory_image = minetest.inventorycube("hyperloop_tube_locked.png",
 		'hyperloop_tube_open.png', "hyperloop_tube_locked.png"),
 	tiles = {
 		-- up, down, right, left, back, front
@@ -233,7 +217,7 @@ minetest.register_node("hyperloop:tubeA", {
 	after_dig_node = function(pos, oldnode, oldmetadata, digger)
 		Tube:after_dig_tube(pos, oldnode, oldmetadata)
 	end,
-	
+
 	paramtype2 = "facedir", -- important!
 	on_rotate = screwdriver.disallow, -- important!
 	paramtype = "light",
@@ -260,7 +244,7 @@ minetest.register_node("hyperloop:tubeA2", {
 	after_dig_node = function(pos, oldnode, oldmetadata, digger)
 		Tube:after_dig_tube(pos, oldnode, oldmetadata)
 	end,
-	
+
 	paramtype2 = "facedir", -- important!
 	on_rotate = screwdriver.disallow, -- important!
 	paramtype = "light",
diff --git a/tubecrowbar.lua b/tubecrowbar.lua
index 2e616de..41108f3 100644
--- a/tubecrowbar.lua
+++ b/tubecrowbar.lua
@@ -12,12 +12,11 @@
 
 -- for lazy programmers
 local SP = function(pos) if pos then return minetest.pos_to_string(pos) end end
-local P = minetest.string_to_pos
-local M = minetest.get_meta
+--local P = minetest.string_to_pos
+--local M = minetest.get_meta
 
 -- Load support for intllib.
 local S = hyperloop.S
-local NS = hyperloop.NS
 
 local Shaft = hyperloop.Shaft
 local Tube = hyperloop.Tube
@@ -36,11 +35,11 @@ end
 local function repair_tubes(itemstack, placer, pointed_thing)
 	if pointed_thing.type == "node" then
 		local pos = pointed_thing.under
-		local dir1, dir2, fpos1, fpos2, fdir1, fdir2, cnt1, cnt2 = 
+		local dir1, dir2, fpos1, fpos2, fdir1, fdir2, cnt1, cnt2 =
 				Shaft:tool_repair_tube(pos, placer, pointed_thing)
 		if fpos1 and fpos2 then
 			if cnt1 + cnt2 >= Shaft.max_tube_length then
-				minetest.chat_send_player(placer:get_player_name(), string.char(0x1b) .. 
+				minetest.chat_send_player(placer:get_player_name(), string.char(0x1b) ..
 						"(c@#ff0000)" .. S("[Hyperloop] Error: Tube is too long!"))
 			end
 			minetest.chat_send_player(placer:get_player_name(), chat_message(dir1, cnt1, fpos1, fdir1))
@@ -52,11 +51,11 @@ local function repair_tubes(itemstack, placer, pointed_thing)
 				max_hear_distance=5,
 				loop=false})
 		else
-			local dir1, dir2, fpos1, fpos2, fdir1, fdir2, cnt1, cnt2 = 
+			dir1, dir2, fpos1, fpos2, fdir1, fdir2, cnt1, cnt2 =
 					Tube:tool_repair_tube(pos, placer, pointed_thing)
 			if fpos1 and fpos2 then
 				if cnt1 + cnt2 >= Shaft.max_tube_length then
-					minetest.chat_send_player(placer:get_player_name(), string.char(0x1b) .. 
+					minetest.chat_send_player(placer:get_player_name(), string.char(0x1b) ..
 						"(c@#ff0000)" .. S("[Hyperloop] Error: Tube is too long!"))
 				end
 				minetest.chat_send_player(placer:get_player_name(), chat_message(dir1, cnt1, fpos1, fdir1))
@@ -70,7 +69,7 @@ local function repair_tubes(itemstack, placer, pointed_thing)
 			end
 		end
 	else
-		minetest.chat_send_player(placer:get_player_name(), 
+		minetest.chat_send_player(placer:get_player_name(),
 			S("[Crowbar Help]\n")..
 			S("    left: remove node\n")..
 			S("    right: repair tube/shaft line\n"))
@@ -83,7 +82,7 @@ local function add_to_inventory(placer, item_name)
 	if inv and item and inv:room_for_item("main", item) then
 		inv:add_item("main", item)
 	end
-end	
+end
 
 local function remove_tube(itemstack, placer, pointed_thing)
 	if minetest.check_player_privs(placer:get_player_name(), "hyperloop") then
@@ -100,10 +99,6 @@ local function remove_tube(itemstack, placer, pointed_thing)
 	end
 end
 
-local function dump_data_base(pos)
-	print(dump(hyperloop.tDatabase))
-end
-
 -- Tool for tube workers to crack a protected tube line
 minetest.register_node("hyperloop:tube_crowbar", {
 	description = S("Hyperloop Tube Crowbar"),
@@ -118,8 +113,8 @@ minetest.register_node("hyperloop:tube_crowbar", {
 	stack_max = 1,
 })
 
-minetest.register_privilege("hyperloop", 
-	{description = S("Rights to remove tube nodes by means of the crowbar"), 
+minetest.register_privilege("hyperloop",
+	{description = S("Rights to remove tube nodes by means of the crowbar"),
 	give_to_singleplayer = false})
 
 
diff --git a/utils.lua b/utils.lua
index 486c535..50053aa 100644
--- a/utils.lua
+++ b/utils.lua
@@ -14,7 +14,7 @@
 local PI = 3.1415926
 
 -- for lazy programmers
-local SP = function(pos) if pos then return minetest.pos_to_string(pos) end end
+--local SP = function(pos) if pos then return minetest.pos_to_string(pos) end end
 local P = minetest.string_to_pos
 local M = minetest.get_meta
 
@@ -40,7 +40,7 @@ end
 
 -- Distance between two points in (tube) blocks
 function hyperloop.distance(pos1, pos2)
-	return math.floor(math.abs(pos1.x - pos2.x) + 
+	return math.floor(math.abs(pos1.x - pos2.x) +
 			math.abs(pos1.y - pos2.y) + math.abs(pos1.z - pos2.z))
 end
 
@@ -67,7 +67,7 @@ function hyperloop.new_pos(pos, facedir, path, y_offs)
 		_pos = vector.add(_pos, vector.multiply(dir, num))
 	end
 	return _pos
-end	
+end
 
 function hyperloop.is_player_around(pos)
 	for _,obj in ipairs(minetest.get_objects_inside_radius(pos, 2)) do
diff --git a/waypoint.lua b/waypoint.lua
index 34a9dda..849db0e 100644
--- a/waypoint.lua
+++ b/waypoint.lua
@@ -17,7 +17,6 @@ local Waypoints = {}
 
 -- Load support for intllib.
 local S = hyperloop.S
-local NS = hyperloop.NS
 
 minetest.register_node("hyperloop:waypoint", {
 	description = S("Hyperloop Waypoint"),
@@ -33,7 +32,7 @@ minetest.register_node("hyperloop:waypoint", {
 			{ -4/16, -8/16, -4/16,  4/16,  -7/16, 4/16},
 		},
 	},
-	
+
 	after_place_node = function(pos, placer)
 		local name = placer:get_player_name()
 		if Waypoints[name] then
@@ -46,7 +45,7 @@ minetest.register_node("hyperloop:waypoint", {
 			name = "Hyperloop",
 			text = "m",
 			world_pos = pos
-		})	
+		})
 	end,
 
 	after_dig_node = function(pos, oldnode, oldmetadata, digger)
@@ -57,9 +56,9 @@ minetest.register_node("hyperloop:waypoint", {
 		end
 	end,
 
-	on_rotate = screwdriver.disallow,	
+	on_rotate = screwdriver.disallow,
 	paramtype = "light",
-	light_source = minetest.LIGHT_MAX,	
+	light_source = minetest.LIGHT_MAX,
 	sunlight_propagates = true,
 	groups = {cracky=2, crumbly=2, choppy=2},
 	is_ground_content = false,
diff --git a/wifi.lua b/wifi.lua
index 9e55a9e..4e4420f 100644
--- a/wifi.lua
+++ b/wifi.lua
@@ -12,7 +12,6 @@
 
 -- Load support for intllib.
 local S = hyperloop.S
-local NS = hyperloop.NS
 
 local Tube = hyperloop.Tube
 
@@ -39,13 +38,13 @@ minetest.register_node("hyperloop:tube_wifi1", {
 	tubelib2_on_update = function(node, pos, out_dir, peer_pos, peer_in_dir)
 		Tube:prepare_pairing(pos, out_dir, sFormspec)
 	end,
-	
+
 	on_receive_fields = function(pos, formname, fields, player)
 		if fields.channel ~= nil then
 			Tube:pairing(pos, fields.channel)
 		end
 	end,
-	
+
 	after_dig_node = function(pos, oldnode, oldmetadata, digger)
 		Tube:stop_pairing(pos, oldmetadata, sFormspec)
 		local tube_dir = tonumber(oldmetadata.fields.tube_dir or 0)