During the early part of the 1900s, the military/government used just about one of everytype built.
Many locomotives were built for variable gauge operation- the 3 Baldwin-Lima-Hamilton RS4TC locomoives we have at the South Carolina Railroad museum, are able to go narrow (not meter narrow though) out to broad gauge, near 6ft if I remember correctly. Most military locomotives are of the small, industrial size, 600hp or smaller. The Army is currently using 1940-1950 rebuilt GP style locomotives at many instillations. We are using two 1950's 80ton center cabs here at Shaw AFB- they were rebuilt in 1992.
Mike, even though there are models, I don't think the military actually ever had carbody locomotives (E and F units, FA and PA units) The missle trains in the 1960-1970s had SD (6 axle) locomotives
The SCRM fleet of locomotives is almost all ex-military. I'm currently working on getting a 1940s Navy locomotive fully operational.
Does this count as a current listed MV for sale link?
Steam Locomotive #612