This locomotive (German BR107/V75, Czech T.435.0 / class 720, Soviet ChME2) looks very similar to the GE U6B locomotive. (or maybe U5B, but U5Bs were mostly narrow gauge ones).
But check the trucks. There were two different types of trucks, you should better use the old ones, "Pennsylvanian type" - they are close to the American ones.

- T.435

- GE U5B
Most of the U6Bs and U5Bs were sold to South and Central America, Asia and Africa, but there were some demonstrators in the USA, and also one U6B served on the Lancaster & Chester Railway for several months.
https://www.thedieselshop.us/GE_U6B.HTMLhttps://www.thedieselshop.us/LanChes.HTMLBut suddenly I've discovered this photo:

- Georgetown Loop Railroad - General Electric 52-ton U6B

- Georgetown Loop Railroad - General Electric 52-ton U6B
Description:
This is a 52-ton, end-cab, narrow-gauge, road-style switcher engine on display at the Colorado Railroad Museum in Golden, Colorado, USA. It was built in 1956 by General Electric and used in Plaster City, California as U.S. Gypsum # 1403 (
http://www.rrpicturearchives.net/showPi ... id=2384121). From 1992 to 2004, the unit was used by the Georgetown Loop Railroad in Colorado as # 140. The engine was acquired by the museum in 2004.
The engine model is a General Electric 52-ton U6B, but it is slightly different from true U6B units. It has been jokingly referred to as a "U5.9B".
The "GB&L" lettering on the cab below the roster number stands for the Georgetown, Breckenridge & Leadville Railroad.
So I think you can find a good prototype for your models. :)
Also notice this nice layout:
http://12mm.ru/viewcard.php?id=62!61!73 ... 4!30!38!2fIt was built in the 1990s by Michael Klostereit, Berlin, Germany. It is "Costa RIca". Notice the diesel locomotive.

- Costa Rica