This model is a North Eastern Railworks repaint of the Alco S2 model created by Dogmouse. You can download the base model at Railworks America. The ALCO S2 was a 1,000 horsepower (746 kW) diesel electric switcher produced by ALCO. The S-2 used ALCO's own "Blunt" trucks, and was powered by ALCO 539 turbocharged, 6-cylinder diesels. The S-2 was built between August 1940 and June 1950, with a total of 1502 completed.
Hope you enjoy.
Harry Adkins