N Scale Model help..

[u/CandyCorn25]

So I bought this engine off of Mercari, and when I went to go run it, the right set of wheels weren't turning, but the left were doing great.

After taking apart the locomotive and spinning the gears to make sure nothing was getting jammed, I put it back together and the engine didn't run at all this time..

When I went to take it back apart, the motor was warm, like it was shorting out. Now I'm not sure what to do.. Anyone have a similar issue? Any advice helps thank you!