Set wagon line number

advtrains/wagons.lua

@@ -291,6 +291,13 @@ function wagon:on_step(dtime)
 		
 		local gp=self:train()
 		local fct=self.wagon_flipped and -1 or 1
+		--set line number
+		if self.name == "advtrains:subway_wagon" and gp.line then
+		   self.object:set_properties({
+			 textures={"advtrains_subway_wagon.png^advtrains_subway_wagon_line"..gp.line..".png"},
+			 visual_size = text_scale,
+		   })
+		end
 		--door animation
 		if self.doors then
 			if (self.door_anim_timer or 0)<=0 then

advtrains_luaautomation/atc_rail.lua

@@ -58,6 +58,10 @@ function r.fire_event(pos, evtdata)
 			train.atc_arrow=atc_arrow
 			return true
 		end,
+		set_line = function(line)
+		   train.line = line
+		   return true
+		end,
 		atc_reset = function(cmd)
 			if not train_id then return false end
 			assertt(cmd, "string")