An EMD GP49 is a 4-axle road switcherdiesel locomotive built by General Motors Electro-Motive Division. Power was provided by an EMD 645F3B12-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, the traction horsepower was rated at while was used to run the onboard 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.
Use
In December 2006, the Alaska Railroad auctioned five units plus parts; Helm Leasing was the winning bidder with a bid of $1.3 million. The Alaska Railroad's four remaining units are still in service as of March, 2007. As of July 2014, units 2803, 2806, and 2807 had been acquired by Frontier Rail and assigned to the new Cincinnati East Terminal Railway in Southwestern Ohio. The units 2805 and 2808 are now part of the fleet of one of the biggest Chilean freight operators, Ferronor S.A and were modified into 6-axle units. They are based out of the Llanos de Soto Workshops of Ferronor S.A, where they operate in Ferronor Vallenar iron ore trains from Los Colorados Mine to the Guacolda Port in Huasco, Chile. Both work with slugs rebuilt from General Electric U9C engines. 2801 and 2802 are now part of the locomotive fleet of TRANSAP, a Chilean railway. They were refitted with A1A bogies, to reduce weight. Columbia-Walla Walla Railway operates three GP49s on the former Blue Mountain Railroad lines in and around Walla Walla,WA as of January 2020. Tri-Rail in Florida has since bought Norfolk Southern's six GP49 variants for use on commuter trains in Florida. The locomotives have since been rebuilt with HEP, and have been de-rated to from. They were also given the designation GP49H-3.
