Yesterday we took a day trip to see the Big Chute Marine Railway, which is a unique lock system that lifts one to six boats from one level of the waterway to the next. See my annotated photos. It is very fast - about ten minutes per trip. The boats are sailed into the chute and fastened. Then a system of cables controls the chute as it goes from one level to the next. Then the boats are quickly sailed off and the next set of boats are loaded.