I've been tinkering with a Lionel 8702 Southern Crescent Locomotive that I picked up as a project. The wheels and collector rollers don't show signs of the engine being run very much, but the mechanism seems to have been made very sloppy, with lots of play at almost all the bearings.
With such sloppiness in the mechanism, the engine does not run very well.
What are other people's experience with these engines? Does yours run well?
The other MPC era steam engines I've handled have had tighter mechanisms, and ran better.
Maybe it is just wear.