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EMD GP49
An EMD GP49 is a 4-axle diesel locomotive built by General Motors Electro-Motive Division. Power was provided by an EMD 645F3B 12-cylinder engine which generated . The GP49 was marketed as one of four models in the 50 series introduced in 1979. The 50 series includes GP/SD49 and GP/SD50. Both the GP and SD50 was relatively popular with a total of 278 GP50s and 427 SD50s built. The SD49 was advertised but never built and a total of 9 GP49s were built.
Alaska Railroad is the only company that ordered it in two orders; the first was ARR 2801-2804 under order number 837049-1-4, built in September 1983 and the second was ARR 2805-2809 under order number 847035-1-5, built in May 1985. Six GP39Xs were built in November 1980 for the Southern Railway under order Number 786284-1-6 and upgraded to GP49s shortly thereafter.
== Performance ==
While possessing a fairly high power rating (total of ), the traction horsepower was rated at while was used to run the on board appliances. The GP49 is known for its slow acceleration, this was due to the radar unit that is mounted under the front pilot to monitor the actual ground speed when the engine is moving to prevent wheel slip. This system is known as EMD's Super Series wheel slip control that was introduced on the GP40X. It tells the engine's computer to slow the speed of the motors to prevent wheel slip. The GP49 is equipped with a 12-645F3B engine with an AR15 alternator rated at 4680 amperes and has four D87 traction motors. Externally the GP49 looks like a GP50 but has two 48" fans above the radiator instead of three as on the GP50, and the engine-room has eight access doors on each side under the Dynamic Brake blister for engine and turbocharger maintenance, while the GP50 has ten.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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