local oldvel = self.object:getvelocity()
	local olddir = vector.normalize(oldvel)
	local x = math.abs(oldvel.x)
	local z = math.abs(oldvel.z)
	local pos = self.object:getpos()
	pos.y = pos.y - 0.5
	local pos2 = self.object:getpos()
	local pos3 = self.object:getpos()
	pos3.y = pos3.y + 0.5
	
	local xer
	local zer
	local dir = {x=0,y=0,z=0}
	
	--check direction
	--x axis
	if x > z then
		if olddir.x>0 then xer=1 elseif olddir.x<0 then xer=-1 end
		--check up
		if minetest.get_node_group(minetest.get_node(vector.new(pos.x+xer,pos.y+1,pos.z)).name,"rail")>0 then
			dir.x = xer
			dir.y = 1
		--check down
		elseif minetest.get_node_group(minetest.get_node(vector.new(pos.x+xer,pos.y-1,pos.z)).name,"rail")>0 then
			dir.x = xer
			dir.y = -1
		--check flat
		elseif minetest.get_node_group(minetest.get_node(vector.new(pos.x+xer,pos.y,pos.z)).name,"rail")>0 then
			dir.x = xer
		end
	--z axis
	elseif z > x then
		if olddir.z>0 then zer=1 elseif olddir.z<0 then zer=-1 end
		--check up
		if minetest.get_node_group(minetest.get_node(vector.new(pos.x,pos.y+1,pos.z+zer)).name,"rail")>0 then
			dir.z = zer
			dir.y = 1
		--check down
		elseif minetest.get_node_group(minetest.get_node(vector.new(pos.x,pos.y-1,pos.z+zer)).name,"rail")>0 then
			dir.z = zer
			dir.y = -1
		--check flat
		elseif minetest.get_node_group(minetest.get_node(vector.new(pos.x,pos.y,pos.z+zer)).name,"rail")>0 then
			dir.z = zer
		end
	end
	
	--turn
	if vector.equals(dir,vector.new(0,0,0)) then
		if x > z then
			if minetest.get_node_group(minetest.get_node(vector.new(pos.x,pos.y,pos.z+1)).name,"rail")>0 then
				dir.z = 1
				--recenter on the rail
				self.object:moveto(vector.new(math.floor(pos2.x+0.5),pos2.y,pos2.z))
			elseif minetest.get_node_group(minetest.get_node(vector.new(pos.x,pos.y,pos.z-1)).name,"rail")>0 then
				dir.z = -1
				--recenter on the rail
				self.object:moveto(vector.new(math.floor(pos2.x+0.5),pos2.y,pos2.z))
			end
		elseif z > x then
			print("zzzz")
			if minetest.get_node_group(minetest.get_node(vector.new(pos.x+1,pos.y,pos.z)).name,"rail")>0 then
				dir.x = 1
				--recenter on the rail
				self.object:moveto(vector.new(pos2.x,pos2.y,math.floor(pos2.z+0.5)))
			elseif minetest.get_node_group(minetest.get_node(vector.new(pos.x-1,pos.y,pos.z)).name,"rail")>0 then
				dir.x = -1
				--recenter on the rail
				self.object:moveto(vector.new(pos2.x,pos2.y,math.floor(pos2.z+0.5)))
			end
		end
	end
	--apply
	--if not vector.equals(dir,vector.new(0,0,0)) then
	self.object:setvelocity(dir)
	--end