I took the engine apart this morning and found a broken gear in the motor assembly. Just bought another engine from eBay.

Thanks for the help.

Yes. Some resistance but they roll.

I have a small HO oval set, probably from the late 1980s. Rarely used. Set up around the Christmas tree. Engine is an EMD GP40 Diesel. It was running this afternoon for a few minutes and then it just stopped. Checked everything. Wiring correct. Engine on the rails. Light comes on in the engine with a buzzing but the engine doesn't even try to move. What to do?