OK, OK, so it’s not the Plymouth of Chrysler fame, but it’s a Plymouth. I just couldn’t resist snapping a few photos from my phone when I saw this awhile back. It was built in 1937 by the Plymouth Locomotive Works in Plymouth, Ohio (where else). It has a Buda or Hercules diesel engine, a torque converter transmission, and chain drive to the wheels.
I wanted to get a picture of it under load but I could not wait that long. But when it does move it makes copious clouds of black smoke and an awful racket!
The operator of this beast said they use it around the yard for shunting. Plymouth Locomotive made little engines like this from 1910 until 1997 and some fifteen hundred or so of them are still in service today.