I am working on both a 2037 and a 2056 steamer and am having issues. The 2037 ran when I bypassed the e-unit but would not budge with the e-unit. Initially one of the contacts melted to the drum. After cleaning up the drum and straightening the contacts I re-assembled the e-unit and the engine will not run at all. Everything seems fine in the e-unit. I replaced the drum and no change. Now it seems the engine won't run when I bypass the e-unit I just get a hum. Everything in the e-unit looks fine. I get continuity in the field coil and between armature sections (low ohms) with no shorts.
The 2056 will not reverse. It will go forward but the reverse position acts as neutral. All the contacts appear to be contacting the drum in the e-unit which moves fine.
Any thoughts as to what I might be missing would be appreciated.