Ran across this:
"The TP56 is intended as a 'railcar mover' for shunting wagons in industrial sidings. It is based on a cut-down EMD SD40 frame with a Caterpillar C9 industrial diesel engine, and is designed to use off-the-shelf industrial and railway components and to be serviced on-site."
https://www.railwaygazette.com...irst-locomotive.html
Lew