Hi All, I'm new to these forums. Former kid with HO layout, never been a "collector"......Just bought a collection that dates back to 1955 (nice Atlas brand track layout with mountains and tunnels!) Included where several Tyco/Mantua Santa Fe 8 wheel drive locomotives. Took them apart and polished the contacts at the trucks and at the motor. Oiled all moving parts which are free to run. Applying power directly to contacts, motor runs, but weakly. Runs on track, but steady light stream of smoke comes from motor (no oil added in that area by me). Have three of these and all are in a "weak" state. I suspect corrosion and poor contacts from sitting..... Is there anything I can do to make these motors run more strongly? Is there any benefit from goofing with brushes. I gather that these Tyco Mantua's are about 20+ years old, but I'm must guessing. Seem like there are very well built.