Additionally, B&O #412 owned by the United Railroad Historical Society is leased out to shortline SMS Lines for revenue freight service.
Baldwin released its VO-1000 model at the same time as its VO-660 design.
The designations behind Baldwin's switchers included engine type (the VO was a diesel engine built by De La Vergne who supplied many prime movers for Baldwin over the years) and horsepower (in this case, 1,000).
It was a very straightforward setup that the company, for one reason or another, elected to change soon after using a complex set of numbers, letters, and dashes (far more complicated than designations other builders would use).
Most sales of the VO-1000 went to large Class I railroads.The Baldwin VO-1000 proved to be the company's most popular diesel locomotive model.Including the later DS-4-4-1000 (which was essentially the same model reclassified) the Baldwin Locomotive Works sold more than 1,000 examples of the design.It also made them marketable for industrial applications where many were also purchased.When production ended on the VO-1000 just after World War II, in December, 1946 548 would be built, which would all but equal Baldwin's total of later cab units and road switchers combined.