An EMD GP20 is a 4-axle diesel-electric locomotive built by General Motors' Electro-Motive Division between November 1959 and April 1962. Power was provided by an EMD 567D2 16-cylinder turbocharged engine which generated 2,000 horsepower (1,500 kW). EMD was initially hesitant to turbocharge their 567-series diesel engine, but was spurred on to do so following successful tests made by Union Pacific in the form of UP's experimental Omaha GP20 units. 260 examples of EMD's production locomotive model (with the EMD turbocharger) were built for American railroads.
The GP20 was the second EMD production locomotive to be built with an EMD turbocharged diesel engine, sixteen months after the six-axle (C-C) model SD24. Power output of the turbocharged SD24 was 33 percent higher than the 1,800 hp (1,340 kW) of the concurrent Roots blower-equipped SD18s with the same engine displacement, 400 hp (298 kW) per axle, but the power output of the turbocharged GP20 was only 11 percent higher than the 1,800 hp (1,340 kW) of the concurrent Roots blower-equipped GP18s with the same engine displacement 500 hp (373 kW) per axle, due to the limitations of the traction motors then available. Nevertheless, the turbocharged GP20 provided full rated power at all altitudes, which the Roots-blown GP18 could not provide.
The turbocharger was the then-new EMD mechanically assisted turbo-compressor. During engine startup, and at lower power levels, during which there is not sufficient exhaust heat energy to drive the turbine fast enough for the compressor to supply the air necessary for combustion, the engine drives the compressor through a gear train and a freewheel. At higher power levels, the freewheel is disengaged, and the turbo-compressor operates as a true turbocharger. It is possible for the turbo-compressor to revert to compressor mode momentarily during commands for large increases in engine power. Turbocharging provides higher horsepower and good running characteristics at all altitudes. Turbocharging also improves fuel consumption and reduces emissions.
Previous Union Pacific experiments with turbocharging had utilized multiple Elliot[1] or Garrett AiResearch turbochargers feeding the usual pair of Roots blowers. EMD's mechanically assisted turbocharger eliminated the need for the pair of Roots blowers and also integrated the turbocharging function from two (Elliot) or four (AiResearch) smaller add-on turbochargers into one much larger, turbo-compressor (turbocharger) with intercooling.
The introduction of the EMD-type turbocharger was successful and all subsequent GP series were offered with this turbocharger, although not all models within a series were offered with turbocharging (e.g., the 38 models were Roots-blown).
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December 26, 2022
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This article includes a list of general references but it lacks sufficient corresponding inline citations Please help to improve this article by introducing more precise citations September 2012 Learn how and when to remove this template message EMD GP20ATSF 3055 in San Bernardino CaliforniaType and originPower typeDiesel electricBuilderGeneral Motors Electro Motive Division EMD ModelGP20Build dateNovember 1959 to April 1962Total produced260SpecificationsConfiguration AARB B UICBo Bo Gauge4 ft 8 1 2 in 1 435 mm Length56 ft 2 in 17 12 m Width10 ft 3 in 3 12 m Height14 ft 6 in 4 42 m Loco weight240 000 lb 108 862 kg Fuel capacity2 350 US gal 8 896 l 1 957 imp gal Lubricant cap 227 US gal 859 l 189 imp gal Coolant cap 220 US gal 833 l 183 imp gal Sandbox cap 18 cu ft 0 51 m3 Prime moverEMD 567D2Engine typeTwo stroke V16 dieselAspirationTurbochargedDisplacement9 072 cu in 148 66 L GeneratorEMD D 22Traction motorsEMD D47 4 or D57 4 Cylinders16Cylinder size8 1 2 in 10 in 216 mm 254 mm TransmissionDiesel electricLoco brakeSchedule 24RL or 26L Straight air optional dynamicPerformance figuresMaximum speed65 mph 105 km h Power output2 000 hp 1 5 MW Tractive effortStarting 63 375 lbf 28 746 kgf Continuous 45 000 lbf 20 412 kgf 9 3 mph 15 0 km h CareerLocaleUnited States An EMD GP20 is a 4 axle diesel electric locomotive built by General Motors Electro Motive Division between November 1959 and April 1962 Power was provided by an EMD 567D2 16 cylinder turbocharged engine which generated 2 000 horsepower 1 500 kW EMD was initially hesitant to turbocharge their 567 series diesel engine but was spurred on to do so following successful tests made by Union Pacific in the form of UP s experimental Omaha GP20 units 260 examples of EMD s production locomotive model with the EMD turbocharger were built for American railroads The GP20 was the second EMD production locomotive to be built with an EMD turbocharged diesel engine sixteen months after the six axle C C model SD24 Power output of the turbocharged SD24 was 33 percent higher than the 1 800 hp 1 340 kW of the concurrent Roots blower equipped SD18s with the same engine displacement 400 hp 298 kW per axle but the power output of the turbocharged GP20 was only 11 percent higher than the 1 800 hp 1 340 kW of the concurrent Roots blower equipped GP18s with the same engine displacement 500 hp 373 kW per axle due to the limitations of the traction motors then available Nevertheless the turbocharged GP20 provided full rated power at all altitudes which the Roots blown GP18 could not provide Contents 1 EMD type Turbo Compressor Turbocharger 2 Original buyers 3 Preservation 4 References 5 External linksEMD type Turbo Compressor Turbocharger EditThe turbocharger was the then new EMD mechanically assisted turbo compressor During engine startup and at lower power levels during which there is not sufficient exhaust heat energy to drive the turbine fast enough for the compressor to supply the air necessary for combustion the engine drives the compressor through a gear train and a freewheel At higher power levels the freewheel is disengaged and the turbo compressor operates as a true turbocharger It is possible for the turbo compressor to revert to compressor mode momentarily during commands for large increases in engine power Turbocharging provides higher horsepower and good running characteristics at all altitudes Turbocharging also improves fuel consumption and reduces emissions Previous Union Pacific experiments with turbocharging had utilized multiple Elliot 1 or Garrett AiResearch turbochargers feeding the usual pair of Roots blowers EMD s mechanically assisted turbocharger eliminated the need for the pair of Roots blowers and also integrated the turbocharging function from two Elliot or four AiResearch smaller add on turbochargers into one much larger turbo compressor turbocharger with intercooling The introduction of the EMD type turbocharger was successful and all subsequent GP series were offered with this turbocharger although not all models within a series were offered with turbocharging e g the 38 models were Roots blown Original buyers EditRailroad Quantity Road numbers NotesElectro Motive Division demonstrators 4 5625 5628 to Southern Pacific 7234 7237Atchison Topeka and Santa Fe Railway 75 1100 1174Chicago Burlington and Quincy Railroad 36 900 935 to Burlington Northern Railroad 2036 2071Great Northern Railway 36 2000 2035 High short hood to Burlington Northern Railroad 2000 2035 1700 gallon fuel tanksNew York Central Railroad 15 6100 6114 no dynamic brake to Penn Central 2100 2112 to Conrail same numbersSouthern Pacific Company 34 7200 7233St Louis Southwestern Railway 20 800 819Union Pacific Railroad 30 700 729Western Pacific Railroad 10 2001 2010 High short hood Second Order used Blomberg B trucks from traded in FTsTotal 260Preservation Edit WP 2001 the first production GP20 leads a special train in 2009 Note the high nose on the short hood Western Pacific 2001 the very first GP20 built is preserved at Western Pacific Railroad Museum at Portola CA KLIX 2003 originally Cotton Belt 815 is being stored at the Arkansas Railroad Museum in Pine Bluff AR Midland Railway 4079 originally Southern Pacific 7229 is on The Midland Railway in Baldwin City Kansas References Edit Elliot Turbochargers Sinor Engine Company Inc Archived from the original on 2012 03 22 Pinkepank Jerry A 1973 The Second Diesel Spotter s Guide Milwaukee Wisconsin Kalmbach Publishing ISBN 978 0 89024 026 7 page needed Omaha GP20 s Union Pacific s GP9 turbocharging program Utah Rails August 29 2015 EMD Road Switchers GP20 Utah Rails http www trainweb org jaydeet gp20 htm Robert Sarberenyi roster with phase information and fuel tank sizeExternal links Edit Wikimedia Commons has media related to EMD GP20 locomotives photos of EMD GP20s rrpicturearchives net Retrieved from https en wikipedia org w index php title EMD GP20 amp oldid 1129608968, wikipedia, wiki, book, books, library,
