Hello Khang Lu: AWESOME VIDEO!!! Watching this answered a lot of questions for me. I often wondered how they transported the continuous rail around the curves. Do those heavy pieces of steel actually have that much flex to them??? Watching them unload that rail answered my question. 9:30 Awesome catch!!! 4:09 This was pretty neat too!!! Watching the rail staying still while the train continued to move forward. Again, great catch!!!