trainQuarryForwardEndless

function dig_forward()
    local success, data
    while turtle.detect() do
        success, data = turtle.inspect()
        if success then
            if (data.name ~= "computercraft:turtle_normal") and (data.name ~= "computercraft:turtle_advanced") then
                turtle.dig()
            else
                break
            end
        else
            turtle.dig()
        end
        sleep(0.5)
    end
end

function dig_up()
    local success, data
    while turtle.detectUp() do
        success, data = turtle.inspectUp()
        if success then
            if (data.name ~= "computercraft:turtle_normal") and (data.name ~= "computercraft:turtle_advanced") then
                turtle.digUp()
            else
                break
            end
        else
            turtle.digUp()
        end
    sleep(0.5)
    end
end

function dig_down()
    local success, data
    while turtle.detectDown() do
        success, data = turtle.inspectDown()
        if success then
            if (data.name ~= "computercraft:turtle_normal") and (data.name ~= "computercraft:turtle_advanced") then
                turtle.digDown()
            else
                break
            end
        else
            turtle.digDown()
        end
    sleep(0.5)
    end
end

while true do
    dig_forward()
    dig_down()
    dig_up()
    turtle.forward()
end