Western Maryland Railway diesel locomotive 7548 leads a freight train at Washington, District of Columbia on July 1, 1982. Western Maryland Railway was later merged into the B&O system and became part of CSX Transportation. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive, freight train

Washington Terminal Company Alco RS1 diesel locomotive number 46 (construction number 74314, built in 1945) at Washington, District of Columbia, on July 5, 1982. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive .

Washington Terminal Company Alco RS1 diesel locomotive number 43 (construction number 72815, built in 1944) parked at the Union Station engine facility in Washington, District of Columbia, on January 23, 1977. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive.

Washington Terminal Company Alco RS1 diesel locomotive number 40 (construction number 71318, built in 1944) awaits its next switching assignment at Washington Union Station in Washington, District of Columbia, on January 23, 1977. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive, station

Washington Metropolitan Area Transit Authority (Metro) train at Washington, District of Columbia, on July 1, 1982. Photo by J.M. Fredrickson. Other Subject Classes: electric locomotive, passenger train.

Washington Metropolitan Area Transit Authority (Metro) passenger train at Washington, District of Columbia, on July 2, 1982, with passengers entering and departing at a Metro station. Photo by J.M. Fredrickson. Other Subject Classes: passenger train, station

Washington Metropolitan Area Transit Authority light rail train at a passenger station in Washington, District of Columbia on July 02, 1982. The sign at the right of the of the platform says "Pentagon." Photo by J.M. Fredrickson. Other Subject Classes: streetcar

Washington Metropolitan Area Transit Authority light rail train at Washington, District of Columbia on July 01, 1982. This photo of a multi-car Washington DC Metro train leaving an elevated passenger station along with railroad tracks and CSX Railroad three bay hopper cars. Photo by J.M. Fredrickson. Other Subject Classes: streetcar

Pennsylvania Railroad electric locomotive 4926 (type GG-1) leads a passenger train at Washington, District of Columbia on July 16, 1964. Photo by J.M. Fredrickson. Other Subject Classes: electric locomotive

Pennsylvania Railroad electric locomotive 4872 (type GG-1) leads a train at Washington, District of Columbia in 1951. Photo by J.M. Fredrickson. Other Subject Classes: electric locomotive