There is a part where a train goes around on a circular track. There is a man in a small shack that you can charm. Make him pull the switch on the wall and the train will come out of a shed. Then, stand back a bit, charm the man again, and make him pull the switch. Quickly run to the shed where the train came out, and you can go in it. If you walk through it, you will be in a place that has a ledge.