22:
90:
840:
587:. 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.
594:
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
582:
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
573:
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.
598:
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
569:, 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
1209:
1224:
196:
1214:
1199:
530:(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
668:
914:
649:
94:
471:
Starting: 63,375 lbf (28,746 kgf) Continuous: 45,000 lbf (20,412 kgf) @9.3 mph (15.0 km/h)
1145:
1135:
1095:
880:
990:
65:
43:
853:
763:
692:
1219:
708:
684:
406:
557:. Power output of the turbocharged SD24 was 33 percent higher than the 1,800 hp (1,340 kW) of the concurrent
98:
716:
1204:
801:
744:
301:
36:
30:
1178:
862:
Midland
Railway 4079, originally Southern Pacific 7229, is on The Midland Railway in Baldwin City, Kansas.
782:
89:
47:
859:
KLIX 2003, originally Cotton Belt 815, is being stored at the
Arkansas Railroad Museum in Pine Bluff, AR.
1004:
983:
628:
550:
515:
306:
185:
128:
538:
units. 260 examples of EMD's production locomotive model (with the EMD turbocharger) were built for
566:
591:
558:
936:
910:
888:
843:
WP #2001, the first production GP20, leads a special train in 2009. Note the high nose on the
839:
523:
380:
370:
319:
976:
419:
350:
466:
118:
960:
906:
360:
590:
Previous Union
Pacific experiments with turbocharging had utilized multiple Elliot or
1193:
1000:
968:
539:
531:
492:
426:
413:
325:
732:
546:
335:
924:
1060:
206:
1140:
1130:
1115:
1105:
1090:
1085:
1035:
1020:
844:
527:
511:
458:
322:
1125:
1110:
1055:
1040:
584:
947:
545:
The GP20 was the second EMD production locomotive to be built with an EMD
1165:
1160:
1155:
1150:
1120:
1100:
1080:
1075:
1070:
1065:
1045:
570:
562:
554:
816:
High short hood; Second Order used
Blomberg B trucks from traded-in FTs
1030:
1025:
1015:
736:
519:
309:
950:
Robert
Sarberenyi roster with phase information and fuel tank size
838:
852:
Western
Pacific 2001, the very first GP20 built, is preserved at
972:
518:
between
November 1959 and April 1962. Power was provided by an
272:
2,350 US gal (8,896 L; 1,957 imp gal)
15:
398: in × 10 in (216 mm × 254 mm)
925:"Omaha GP20's, Union Pacific's GP9 turbocharging program"
288:
220 US gal (833 L; 183 imp gal)
280:
227 US gal (859 L; 189 imp gal)
488:
483:
465:
453:
445:
440:
412:
402:
379:
369:
359:
349:
341:
331:
315:
300:
292:
284:
276:
268:
260:
252:
244:
236:
205:
194:
183:
174:
169:
151:
143:
135:
124:
114:
109:
82:
549:diesel engine, sixteen months after the six-axle (
1210:Diesel-electric locomotives of the United States
1225:Standard gauge locomotives of the United States
984:
8:
991:
977:
969:
583:the compressor through a gear train and a
526:turbocharged engine which generated 2,000
480:
437:
166:
106:
66:Learn how and when to remove this message
948:http://www.trainweb.org/jaydeet/gp20.htm
610:
578:EMD-type Turbo-Compressor (Turbocharger)
29:This article includes a list of general
872:
669:Chicago, Burlington and Quincy Railroad
516:General Motors' Electro-Motive Division
1215:Railway locomotives introduced in 1959
129:General Motors Electro-Motive Division
79:
650:Atchison, Topeka and Santa Fe Railway
345:9,072 cu in (148.66 L)
7:
1200:Electro-Motive Division locomotives
240:56 ft 2 in (17.12 m)
711:2000–2035, 1700 gallon fuel tanks
595:(turbocharger) with intercooling.
256:14 ft 6 in (4.42 m)
248:10 ft 3 in (3.12 m)
35:it lacks sufficient corresponding
14:
903:The Second Diesel Spotter's Guide
534:in the form of UP's experimental
264:240,000 lb (108,862 kg)
296:18 cu ft (0.51 m)
88:
20:
854:Western Pacific Railroad Museum
764:St. Louis Southwestern Railway
644:to Southern Pacific 7234–7237
1:
901:Pinkepank, Jerry A. (1973).
709:Burlington Northern Railroad
685:Burlington Northern Railroad
510:is a 4-axle diesel-electric
449:65 mph (105 km/h)
147:November 1959 to April 1962
1241:
937:"EMD Road Switchers: GP20"
603:models were Roots-blown).
99:San Bernardino, California
1174:
1011:
885:Sinor Engine Company, Inc
717:New York Central Railroad
479:
436:
165:
105:
87:
905:. Milwaukee, Wisconsin:
802:Western Pacific Railroad
745:Southern Pacific Company
1179:List of EMD locomotives
629:Electro Motive Division
50:more precise citations.
881:"Elliot Turbochargers"
848:
783:Union Pacific Railroad
693:Great Northern Railway
365:EMD D47 (4) or D57 (4)
1036:GP15-1, GP15AC, GP15T
964:rrpicturearchives.net
842:
731:no dynamic brake; to
418:Schedule 24RL or 26L
707:High short hood; to
1220:Freight locomotives
961:photos of EMD GP20s
907:Kalmbach Publishing
567:engine displacement
441:Performance figures
1166:GP60, GP60B, GP60M
1091:GP38-2/38-2L/38-2W
931:. August 29, 2015.
849:
592:Garrett AiResearch
1187:
1186:
916:978-0-89024-026-7
832:
831:
502:
501:
498:
497:
475:
474:
432:
431:
161:
160:
76:
75:
68:
1232:
993:
986:
979:
970:
944:
932:
920:
893:
892:
887:. Archived from
877:
631:(demonstrators)
611:
481:
438:
397:
396:
392:
389:
231:
227:
225:
224:
220:
217:
167:
154:
107:
92:
80:
71:
64:
60:
57:
51:
46:this article by
37:inline citations
24:
23:
16:
1240:
1239:
1235:
1234:
1233:
1231:
1230:
1229:
1205:B-B locomotives
1190:
1189:
1188:
1183:
1170:
1007:
997:
957:
935:
923:
917:
900:
897:
896:
879:
878:
874:
869:
856:at Portola, CA.
837:
813:
808:
794:
789:
775:
770:
756:
751:
728:
723:
704:
699:
680:
675:
661:
656:
641:
636:
609:
607:Original buyers
580:
504:
503:
467:Tractive effort
407:Diesel electric
394:
390:
387:
385:
361:Traction motors
229:
222:
218:
215:
213:
212:4 ft
211:
176:
152:
119:Diesel-electric
110:Type and origin
101:
72:
61:
55:
52:
42:Please help to
41:
25:
21:
12:
11:
5:
1238:
1236:
1228:
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1128:
1123:
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1103:
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1083:
1078:
1073:
1068:
1063:
1058:
1053:
1048:
1043:
1038:
1033:
1028:
1023:
1018:
1012:
1009:
1008:
1001:road switchers
998:
996:
995:
988:
981:
973:
967:
966:
956:
955:External links
953:
952:
951:
945:
933:
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895:
894:
891:on 2012-03-22.
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792:
790:
787:
785:
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773:
771:
768:
766:
760:
759:
757:
754:
752:
749:
747:
741:
740:
735:2100-2112; to
729:
726:
724:
721:
719:
713:
712:
705:
702:
700:
697:
695:
689:
688:
681:
678:
676:
673:
671:
665:
664:
662:
659:
657:
654:
652:
646:
645:
642:
639:
637:
634:
632:
625:
624:
621:
618:
615:
608:
605:
579:
576:
565:with the same
500:
499:
496:
495:
490:
486:
485:
477:
476:
473:
472:
469:
463:
462:
455:
451:
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416:
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383:
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367:
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357:
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343:
339:
338:
333:
329:
328:
317:
313:
312:
304:
298:
297:
294:
290:
289:
286:
282:
281:
278:
277:Lubricant cap.
274:
273:
270:
266:
265:
262:
258:
257:
254:
250:
249:
246:
242:
241:
238:
234:
233:
209:
203:
202:
199:
192:
191:
188:
181:
180:
177:
175:Configuration:
172:
171:
170:Specifications
163:
162:
159:
158:
155:
153:Total produced
149:
148:
145:
141:
140:
137:
133:
132:
126:
122:
121:
116:
112:
111:
103:
102:
93:
85:
84:
78:
77:
74:
73:
56:September 2012
28:
26:
19:
13:
10:
9:
6:
4:
3:
2:
1237:
1226:
1223:
1221:
1218:
1216:
1213:
1211:
1208:
1206:
1203:
1201:
1198:
1197:
1195:
1182:
1180:
1173:
1167:
1164:
1162:
1159:
1157:
1154:
1152:
1149:
1147:
1144:
1142:
1139:
1137:
1134:
1132:
1129:
1127:
1124:
1122:
1119:
1117:
1114:
1112:
1109:
1107:
1104:
1102:
1099:
1097:
1094:
1092:
1089:
1087:
1084:
1082:
1079:
1077:
1074:
1072:
1069:
1067:
1064:
1062:
1059:
1057:
1054:
1052:
1049:
1047:
1044:
1042:
1039:
1037:
1034:
1032:
1029:
1027:
1024:
1022:
1019:
1017:
1014:
1013:
1010:
1006:
1002:
994:
989:
987:
982:
980:
975:
974:
971:
965:
962:
959:
958:
954:
949:
946:
942:
938:
934:
930:
926:
922:
918:
912:
908:
904:
899:
898:
890:
886:
882:
876:
873:
866:
861:
858:
855:
851:
850:
846:
841:
834:
828:
826:
823:
820:
819:
815:
810:
805:
803:
800:
799:
796:
791:
786:
784:
781:
780:
777:
772:
767:
765:
762:
761:
758:
753:
748:
746:
743:
742:
739:same numbers
738:
734:
730:
725:
720:
718:
715:
714:
710:
706:
701:
696:
694:
691:
690:
686:
682:
677:
672:
670:
667:
666:
663:
658:
653:
651:
648:
647:
643:
638:
633:
630:
627:
626:
622:
619:
616:
613:
612:
606:
604:
602:
596:
593:
588:
586:
577:
575:
572:
568:
564:
560:
556:
552:
548:
543:
541:
537:
533:
532:Union Pacific
529:
525:
521:
517:
513:
509:
494:
493:United States
491:
487:
482:
478:
470:
468:
464:
461:(1.5 MW)
460:
456:
452:
448:
446:Maximum speed
444:
439:
435:
428:
425:
421:
417:
415:
411:
408:
405:
401:
384:
382:
381:Cylinder size
378:
374:
372:
368:
364:
362:
358:
354:
352:
348:
344:
340:
337:
334:
330:
327:
324:
321:
318:
314:
311:
308:
305:
303:
299:
295:
291:
287:
283:
279:
275:
271:
269:Fuel capacity
267:
263:
259:
255:
251:
247:
243:
239:
235:
230:1,435 mm
210:
208:
204:
200:
198:
195: •
193:
189:
187:
184: •
182:
178:
173:
168:
164:
156:
150:
146:
142:
138:
134:
130:
127:
123:
120:
117:
113:
108:
104:
100:
96:
91:
86:
81:
70:
67:
59:
49:
45:
39:
38:
32:
27:
18:
17:
1176:
1050:
963:
940:
928:
902:
889:the original
884:
875:
835:Preservation
733:Penn Central
620:Road numbers
600:
597:
589:
581:
559:Roots blower
547:turbocharged
544:
535:
520:EMD 16-567D2
507:
505:
454:Power output
423:
420:Straight air
403:Transmission
342:Displacement
336:Turbocharged
293:Sandbox cap.
285:Coolant cap.
62:
53:
34:
1177:(See also:
1071:GP30, GP30B
542:railroads.
457:2,000
316:Engine type
302:Prime mover
261:Loco weight
48:introducing
1194:Categories
941:Utah Rails
929:Utah Rails
867:References
845:short hood
687:2036–2071
561:-equipped
536:Omaha GP20
528:horsepower
512:locomotive
414:Loco brake
332:Aspiration
320:Two-stroke
144:Build date
115:Power type
31:references
1031:GP9, GP9B
1026:GP7, GP7B
1003:built by
812:2001–2010
755:7200–7233
727:6100–6114
703:2000–2035
660:1100–1174
640:5625–5628
585:freewheel
514:built by
424:optional:
371:Cylinders
351:Generator
1016:BL1, BL2
617:Quantity
614:Railroad
553:) model
540:American
524:cylinder
508:EMD GP20
355:EMD D-22
310:16-567D2
226: in
179:
97:3055 in
83:EMD GP20
1141:GP40P-2
1096:GP38H-3
1061:GP22ECO
999:4-axle
793:700–729
774:800–819
737:Conrail
679:900–935
427:dynamic
393:⁄
221:⁄
125:Builder
44:improve
1146:GP40TC
1131:GP40-2
1116:GP39-2
1106:GP39DC
1086:GP38AC
1021:BL20-2
913:
623:Notes
489:Locale
484:Career
326:diesel
253:Height
237:Length
201:Bo′Bo′
33:, but
1136:GP40P
1126:GP40X
1111:GP39X
1056:GP20D
1041:GP15D
821:Total
571:GP18s
563:SD18s
245:Width
207:Gauge
136:Model
131:(EMD)
1161:GP59
1156:GP50
1151:GP49
1121:GP40
1101:GP39
1081:GP38
1076:GP35
1066:GP28
1051:GP20
1046:GP18
911:ISBN
555:SD24
506:The
139:GP20
95:ATSF
1005:EMD
824:260
683:to
551:C-C
522:16-
323:V16
307:EMD
197:UIC
190:B-B
186:AAR
157:260
1196::
939:.
927:.
909:.
883:.
807:10
788:30
769:20
750:34
722:15
698:36
674:36
655:75
601:38
459:hp
422:,
375:16
1181:)
992:e
985:t
978:v
943:.
919:.
847:.
635:4
395:2
391:1
388:+
386:8
232:)
228:(
223:2
219:1
216:+
214:8
69:)
63:(
58:)
54:(
40:.
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
