thankyou, i may not have been clear. But the info about mth, peerless, etc is valuable. what i forgot to say is that the trolley track will be elevated and independent of the train tracks so Dc for the trolley is viable while dcc for the train is the best choice. i have seen some electronic products for trolleys that do what i "will" want but correlation of that with an ho trolley/cable car product in a 15" radius environment is almost impossible for a newbee like me.