The RT-624, an improved version of the former Baldwin DT-6-6-2000, was a center-cab transfer locomotive.
Twenty-four locomotives were built using 6-cylinder turbocharged 606A prime movers during 1951–1954. Penn Central operated ex-PRR #8955, and was retired in October 1969, and scrapped in July 1970.
Kirkland, John F. (1994). The Diesel Builders (Volume 3, Baldwin Locomotive Works). Interurban Press. ISBN0-916374-93-9.
Pinkepank, Jerry A. (1973). The Second Diesel Spotter's Guide. Kalmbach Publishing Co. ISBN0-89024-026-4.
Dolzall, Gary W. & Dolzall, Stephen F. (1984). Diesels From Eddystone: The Story of Baldwin Diesel Locomotives. Kalmbach Publishing Co. ISBN0-89024-052-3.