local sslot = 1
while true do

if turtle.getFuelLevel() > 0 then -- check fuel level
	turtle.select(sslot) -- if it has fuel it proceeds
	print ("todo bien")
if turtle.getItemCount() > 0 then -- checks if current slot has items
local details = turtle.getItemDetail() -- check if item is a rail
	if details.name = "Railcraft:track" then-- check if item is a rail
	turtle.forward() then -- moves forward
	turtle.digDown()
	turtle.placeDown()
print ("todo bien")
if turtle.getItemCount(15) > 1 then
	turtle.drop(1)
	print ("todo bien")
	end
	else
	sslot = (sslot%16)+1
	turtle.select(sslot)
	print ("todo bien")
	end
else
	sslot = (sslot%16)+1
	turtle.select(sslot)
	print ("todo bien")
end
else
	turtle.select(16)
	turtle.refuel(1)
	print ("todo bien")
end
	sleep(1)
end