This is a N scale set. I doubled checked all the connections, A to A and B to B...as far as I can tell all the wires are good. I turn it on and I have to push the trolley for it to move, then it goes to the end of the track and stops....nothing else. I have ordered a new trolley, I am hoping that its just the trolley that I have, even thought I did try an engine on it, and the same problem. This system is supposed to take any engine, so this is getting very frustrating, 2 days at this now....I can not find anything online about it.