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

Consolidated Rail Corporation (Conrail) diesel locomotive 3303 at Washington, District of Columbia on July 5, 1982. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive

Chesapeake and Ohio Railway diesel locomotive 4330 at Washington, District of Columbia on July 1, 1982. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive, coal train

Amtrak diesel locomotive 7110, a switch engine at Washington, District of Columbia on January 23, 1977. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive, passenger train

Amtrak diesel locomotive 389 at Washington, District of Columbia on July 1, 1982. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive, passenger train