I was browsing eBay a couple months ago when I found this strange brass ho scale locomotive. I believe it could be a Japanese EF58 electric locomotive however I'm no expert on identifying different types of locomotives.
In any case this one had several mechanical issues which needed to be sorted out. The wiring was a mess with the insulation having dry rotted over time. Everything was in desperate need of a good cleaning and the gears all needed fresh oil.
I'm overall satisfied with the results of this repair, despite some of the tricky adjustments I had to do with the wheels etc.