Athearn RTR 1520 HO Scale EMD GP50 BNSF 3146 DCC/Sound UniTrack - Platform Detroit Diesel 2-71 Genset visible

Detroit Diesel 2-71 Genset visible inside

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The most common replacement locomotive became the GP38-2

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The testbed units would be dubbed “Phase Ia”

Athearn RTR 1520 HO Scale EMD GP50 BNSF 3146 DCC/Sound UniTrack - Platform Detroit Diesel 2-71 Genset visibleAthearn RTR 1520 HO Scale EMD GP50 BNSF 3146 DCC Sound The EMD GP50 is a 4 axle diesel road switcher locomotive built by General Motors Electro Motive Division between 1980 and 1985. It is powered by a 16 cylinder EMD 645F3B diesel engine, which can produce between 3,500 and 3,600 hp. A total of 278 examples of this locomotive were built. The GP50 retains the same overall length of 59 feet 2 inches as the other GP dash 2 series locomotives built in