Thank you so much for your replies. I bench tested the engine today without any tinkering whatsoever and amazingly the motor took off like it had just left the factory. I did not test run it on a track as the wheels are showing signs of deterioration and I did not want to risk doing any damage.
I will take much better pictures of the pieces, especially the locomotive, and put them for sale here on the Forum for $75. I'd prefer not to go the E-Bay route.
Again thanks for your help.
Don