Ran across these at a mostly abandoned coal mine and processing plant in Polly KY.
I am no expert on engines, but these are switchers made by the General Motors Electromotive Division…maybe carry the NW designation, which would mean they date from the early 40s. I was able to get the serial number, but it didn’t yield any information when I conducted a search.
These have been hit by vandals. That’s no surprise.