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Ingalls 4-S
The Ingalls 4-S was an experimental American locomotive built by Ingalls Shipbuilding immediately after World War II. Intended to be the first of many Ingalls-built locomotives, it wound up being the only one ever built by the company. It served on the Gulf, Mobile and Ohio Railroad (GM&O) until 1966, when it was retired; it was scrapped the following year.
==Design and development==
At the end of World War II, Ingalls Shipbuilding, based in Pascagoula, Mississippi, developed plans for a line of diesel-electric locomotives to serve the expected post-war market. Five models were projected; the first, and as it proved only, to be built was a prototype of the largest, the model 4-S.〔''GM&O Historical Society News'', Issue #42, 1986. Via (National Model Railroad Association, Pacific Coast Region ). Retrieved 2012-01-17.〕
The design of the locomotive was considered advanced, including a "turret cab" arrangement, which improved the crew's vision. The prime mover selected for the locomotive was based on a marine diesel engine built by Superior Engines & Compressors; it produced , of which was available for the production of tractive effort by the locomotive's electric drive.〔 Provision was made for the installation of a steam generator for passenger service.〔 The locomotive was equipped with connections for multiple unit operation.〔"The Ingalls 1500-HP. Diesel-Electric Locomotive". ''Diesel Power'', Volume 24, 1946. Pages 588-589, 614〕
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