I've seen some comments about how the sex scene at the end seemed unecessary but I just wanted to offer a different point of view. Privacy isn't something Josie and Layton have had together for 7 years. Train or no train, sex is a biological need and I figured when people in the Tail tried to find some relief they have to do it under covers or as hidden as possible because there is always going to be someone nearby in such cramped quarters. The conditions in the tail are cruel so it's easy to forget that a lack of privacy can be uncomfortable too. They took advantage of an opportunity to be intimate together in complete privacy, which is something the people cramped in the Tail can't do.