The Beaver Hole Hardwood Company Begins

Not too many diesels around in the 1930's.

One off GE/IR boxcabs maybe.

IIRC the first SW-1 was 1938.
Meh, Plymouth Locomotive Works goes way back with small gas and diesel locomotives. "Critters" as they are called. My little orange one represents about a 15 ton. Complete with its own fuel tank.....of "whatever" it's running on. lol