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An EMD GP50 is a 4-axle road switcherdiesel-electriclocomotive built by General Motors Electro-Motive Division (EMD). It is powered by a 16-cylinderEMD 645F3B diesel engine, which can produce between 3,500 and 3,600 hp (2,610 and 2,685 kW). 278 examples of this locomotive were built by EMD between 1980 and 1985. BN 3110-3162 were all delivered with five cab seats, the final five of these having the cab lengthened 23 in (584 mm) vs. the standard EMD cab. The GP50 retains the same overall length of 59 feet 2 inches (18.03 meters) as the EMD GP38, EMD GP38-2, EMD GP39, EMD GP39-2, EMD GP40 and EMD GP40-2.
In 2015–2016 the Norfolk Southern Railway rebuilt 28 of their GP50s into the low-emission GP33ECO.[1] And in early 2016, Norfolk Southern rebuilt one GP50 into their first GP59ECO. These units, most of which utilized GP59 cores, have similar specifications as the earlier GP33ECO program but have been built without public funding contributing to their construction.
3100-3109 ordered by St. Louis – San Francisco Railway, but delivered to BN. 3100 only one that received Frisco colors, though with BN number. Most now in service with BNSF Railway