digtun2

function retFuel()
  if turtle.getFuelLevel() > 50 then
    return true
  end
  return refuel()
end

function refuel()
  turtle.select(1)
  if turtle.getItemCount() > 15 then
    turtle.transferTo(16,10)
    turtle.select(16)
    turtle.refuel()
    return true
  end
  return false
end

local counter = 0
local railcounter =0

while retFuel()==true do
  turtle.dig()
  turtle.forward()
  turtle.digUp()
  turtle.digDown()

  --turtle.select(3)
  --turtle.placeDown()

  counter = counter+1
  if counter == 4 then
    turtle.select(2)
    turtle.turnLeft()
    turtle.turnLeft()
    turtle.place()
    turtle.turnLeft()
    turtle.turnLeft()
    counter = 0
  end
  railcounter = railcounter+1
  if railcounter < 5 then
    turtle.select(3)
    turtle.placeDown()
  end
  if railcounter >= 5 then
    turtle.down()
    turtle.digDown()
    turtle.down()
    turtle.digDown()
    --turtle.down()
    --turtle.digDown()

    turtle.select(5)
    turtle.placeDown()
    turtle.up()
    turtle.select(6)
    turtle.placeDown()
    turtle.up()
    turtle.select(4)
    turtle.placeDown()
    railcounter = 0
  end
end