Recently on eBay I bought an unpainted GP-18 so that I could put an old Proto 2000 shell over top of it. The train could not run anymore because I think my dad buggered up the wiring in it attempting to fix it but making it worse in the process however the flywheels and motor are intact. Could I use the motor/flywheels and put it into an Athearn so it doesn't go to waste or should I not bother because of difficulty in it fitting?