Would that not rely on the trolley going to the end of travel? I'm thinking you would end up with both stuck in the middle if done that way, no?
True but I'm sure a good majority of the kids going aren't going to make it to the other platform..It would if left loose. As long as it's in use, the rider is going to take a trolley to the end, and the attendant at the start would grab the returning trolley. You could put a handle on the pulley for manual retrieval in those cases when it was needed.