Turtle Track Layer

-- turtle track layer
local boosterInterval = 6
local boosterCounter = boosterInterval
turtle.select(1)
turtle.refuel()
turtle.select(2)

function tryPlaceRail()
    turtle.select(2)
    if turtle.place() then return end

    turtle.select(3)
    if turtle.place() then return end

    turtle.select(4)
    if turtle.place() then return end

    turtle.select(5)
    if turtle.place() then return end

    turtle.select(6)
    if turtle.place() then return end

    turtle.select(7)
    if turtle.place() then return end

    turtle.select(8)
    if turtle.place() then return end
end

function tryPlaceBooster()
    turtle.select(9)
    if turtle.place() then return end

    turtle.select(10)
    if turtle.place() then return end

    turtle.select(11)
    if turtle.place() then return end

    turtle.select(12)
    if turtle.place() then return end
end

local canAdvance = turtle.back()
while canAdvance do
    boosterCounter = boosterCounter - 1
    if boosterCounter == 0 then
        tryPlaceBooster()
        boosterCounter = boosterInterval
    else
        tryPlaceRail()
    end

    if turtle.getFuelLevel() == 0 then
        turtle.select(1)
        turtle.refuel()
    end
    canAdvance = turtle.back()
end