I bought wiper material from a forum member here (Rod ?). He sells pre-cut strips. I bend them as needed and cut the extra off. Right where the wipers touch the back of the wheels, I use a punch on the back side to create a slight dimple. That helps reduce friction there.
Yes, a lighted or sound equipped car can run on 2 rail AC. If it's designed for DC only, you simply add a bridge rectifier. Plenty of those posts in the electrical forum here about converting to LED lights.
All equipment must have insulated wheels on at least on side for this to work. So converting old engines that weren't meant to come apart easily, can be quite a chore. Those are better left alone unless you really desire one.
