Ingalls 4-S

The Ingalls 4-S was a single experimental diesel-electric locomotive built by Ingalls Shipbuilding of Pascagoula, Mississippi, in March 1946, in the months after World War II. The shipyard planned a line of five diesel-electric models for the expected postwar railroad market, and the 4-S demonstrator, the largest of them, was the only one ever built. It was an advanced design for its day, with a turret cab meant to give the crew a better view, a marine-derived eight-cylinder inline diesel prime mover rated at 1,650 horsepower, and connections for multiple-unit operation. Several railroads tested it but no orders followed, and Ingalls abandoned locomotive building. The Gulf, Mobile and Ohio Railroad bought it in June 1946 as number 1900 and used it for switching until 1966, after which it was traded to EMD and scrapped in 1967.