local sslot = 1
while true do

if turtle.getFuelLevel() > 0 then
    turtle.select(sslot)
if turtle.getItemCount() > 0 then
local details = turtle.getItemDetail()
    if details.name == "Railcraft:track" then
    if turtle.forward() then
 print ("Turtle moved forward.")
    turtle.digDown()
    turtle.placeDown()
	turtle.select(15)
	turtle.drop(1)
    else
    print ("Turtle didn't move forward.")
end
    else
    sslot = (sslot%13)+1
    turtle.select(sslot)

    end
else
    sslot = (sslot%13)+1
    turtle.select(sslot)
end
else
    turtle.select(16)
    turtle.refuel(1)
end
    sleep(1)
end