|
The RS3m is a diesel-electric locomotive rebuilt from an ALCO RS-3 road switcher. There are many variations with various spotting features, the common features being the ALCO RS-3 frame, trucks, and usually cab and short hood. Railroads started rebuilding their RS-3 fleets early on because of the unreliability of the ALCO 244 prime movers. Perhaps one of the earliest examples of the RS3m is the former Missouri-Kansas-Texas Railroad's RS3m fleet. Built in the early 1950s by ALCO, the Katy had them rebuilt in the late 1950s by ALCO competitor, EMD, who rebuilt them with GP9 long hoods to make room for the larger EMD 567 prime movers. The Chicago and North Western Railway had a fleet of RS-3ms that were rebuilt using ALCO components. These feature long hoods from ALCO RS-11 road switchers. Penn Central started rebuilding RS-3s in 1972, using parts from retired EMD passenger engines. The RS3m rebuild program started in 1972 and continued until 1978 under Conrail. The bankrupt Penn Central needed more reliable local and secondary service locomotives and had a surplus of passenger locomotives. The result is a locomotive that has the frame, body and trucks from an ALCO RS3, but using fan assemblies and EMD 567 prime movers from retired passenger engines, such as the EMD E8, in place of the original ALCO 244 prime movers. The principal visible difference on the Penn Central/Conrail rebuilds is the addition of two conical-shaped EMD switcher style exhaust stacks in place of the one rectangular-shaped ALCO stack and a raised hood. Later rebuilds would just have a raised feature on the long hood to accommodate the larger prime mover. The shape would vary from a rectangular shape with fillets on the long sides to a simple box on top of the long hood. These locomotives are often called DeWitt Geeps, so named because Penn Central started rebuilding them in their DeWitt, shops in Syracuse, New York. In 1975 The Green Bay and Western Railroad started rebuilding their four RS-3 units. They lowered the nose and raised the long hood for their new Alco engines. These rebuilds are called RS-20s. ==RS3u== The Delaware and Hudson Railway had eight RS3u locomotives which are often mistakenly called RS3m's. These locomotives were rebuilt by Morrison-Knudsen of Boise, ID (also known as M-K TE56's) between December 1975 and March 1976. They received ALCO 12-251C prime movers, boosting horsepower from . To facilitate the larger prime mover, M-K raised the long hood and moved the dynamic brake cooling to a box behind the cab. The units also received a cut-down short hood for greater visibility. The D&H was not overly fond of the conversions, referring to them as "Club Foots", because of their tendency to slip under heavy loads. It was thought that the 2000 hp prime mover was too powerful for the lightweight carbody. Today, D&H #506 survives at the Western New York & Pennsylvania Railroad awaiting restoration. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「RS3m」の詳細全文を読む スポンサード リンク
|