170:, built starting in 1936. 43 were built until 1950 but were operated until 1959 to prepare the ending of steam power. The powerful 2-6-6-4s were capable of more than 5,000 drawbar horsepower at 45 mph (72 km/h) and could reach 70 mph (110 km/h), while pulling heavy coal trains. They were used until dieselization in 1959.
20:
136:
supported by four-wheel trailing trucks. Such a firebox could sustain a rate of steam generation to meet any demands of the locomotive's cylinders, even at high speed. High speeds were certainly among the design goals for the 2-6-6-4; most of the type were intended for use on fast freight trains.
1085:
144:, and these were not high-speed locomotives but rather mountain engines. They received three in 1934 and four more in 1937 and operated the 2-6-6-4s until 1953.
1080:
190:
232:
227:
259:
141:
178:
177:
was preserved and in 1987 was restored to running order, running on excursions until 1991. Today it is on display at the
1106:
592:
167:
163:
156:
602:
252:
585:
174:
1111:
981:
913:
784:
673:
133:
91:
76:
55:
1075:
1061:
129:
82:
237:
971:
964:
959:
952:
947:
942:
921:
245:
100:
1056:
985:
917:
686:
677:
387:
111:
65:
1051:
1038:
788:
607:
148:
35:
681:
125:
32:
1046:
268:
51:
28:
222:
217:
23:
Norfolk & Western A class No. 1206 displayed at the New York World's Fair in 1939.
1100:
152:
47:
43:
774:
769:
764:
759:
754:
747:
742:
737:
732:
727:
722:
717:
710:
705:
700:
695:
151:
in 1935 and 1937. These were high-speed freight engines and very successful. Upon
935:
930:
903:
173:
In all, sixty 2-6-6-4s were constructed in North
America. Only one remains:
342:
228:
builder's photo of N&W 1212, engineer's side, Virginia Tech collection
631:
233:
builder's photo of N&W 1212, fireman's side, Virginia Tech collection
896:
891:
886:
881:
876:
871:
866:
859:
854:
849:
844:
839:
829:
824:
819:
812:
807:
802:
797:
663:
658:
653:
648:
643:
636:
626:
621:
616:
580:
19:
1023:
994:
575:
570:
565:
558:
553:
548:
543:
538:
533:
528:
471:
439:
419:
377:
372:
357:
352:
317:
302:
1028:
1016:
1011:
1006:
999:
521:
516:
511:
506:
501:
496:
491:
486:
481:
476:
466:
461:
454:
449:
444:
434:
429:
424:
414:
409:
404:
397:
392:
382:
367:
362:
347:
337:
329:
322:
312:
307:
297:
292:
287:
282:
205:
Steam's
Camelot: Southern and Norfolk Southern Excursions in Color
241:
124:
The 2-6-6-4 was a fairly late development, a product of the
140:
The first 2-6-6-4s built in the United States were for the
218:
picture of N&W 1218 pulling an excursion train in 1988
147:
The next of the type was a class of ten ordered by the
269:
Steam locomotive wheel arrangements (Whyte notation)
1037:
980:
912:
783:
672:
601:
275:
253:
223:side view of N&W 1218 under steam in 1987
8:
260:
246:
238:
75:(also known as German classification and
18:
16:Articulated locomotive wheel arrangement
159:in 1947, who operated them until 1953.
191:Trains.com article on the 2-6-6-4 type
61:Other equivalent classifications are:
142:Pittsburgh and West Virginia Railroad
7:
162:The final class of 2-6-6-4s was the
132:, which encouraged the use of large
121:for simple articulated locomotives.
14:
179:Virginia Museum of Transportation
42:is a locomotive with a two-wheel
1:
128:concept, introduced by the
164:Norfolk and Western Railway
157:Baltimore and Ohio Railroad
1128:
155:the class was sold to the
54:. All 2-6-6-4s are simple
31:for the classification of
1070:
175:Norfolk and Western 1218
982:Articulated locomotives
972:2-4-4-2+2-8-8-2+2-4-4-2
914:Articulated locomotives
785:Articulated locomotives
674:Articulated locomotives
198:N&W: Giant of Steam
56:articulated locomotives
1074:Other notation forms:
92:Turkish classification
77:Italian classification
24:
948:0-6-2+2-4-2-4-2+2-6-0
130:Lima Locomotive Works
83:French classification
22:
196:Jeffries, Lewis I.,
101:Swiss classification
1107:2-6-6-4 locomotives
276:Single engine types
50:, and a four-wheel
1039:Geared locomotives
965:2-10-10-10-10-10-2
112:UIC classification
66:UIC classification
46:, two sets of six
25:
1094:
1093:
149:Seaboard Air Line
36:wheel arrangement
1119:
262:
255:
248:
239:
200:(Rev. ed. 2005).
126:superpower steam
119:
73:
33:steam locomotive
1127:
1126:
1122:
1121:
1120:
1118:
1117:
1116:
1097:
1096:
1095:
1090:
1066:
1033:
984:
976:
953:2-6-6-2+2-6-6-2
916:
908:
787:
779:
684:
676:
668:
606:
597:
271:
266:
214:
187:
117:
71:
17:
12:
11:
5:
1125:
1123:
1115:
1114:
1112:Whyte notation
1109:
1099:
1098:
1092:
1091:
1089:
1088:
1083:
1078:
1071:
1068:
1067:
1065:
1064:
1059:
1054:
1049:
1043:
1041:
1035:
1034:
1032:
1031:
1026:
1020:
1019:
1014:
1009:
1003:
1002:
997:
991:
989:
978:
977:
975:
974:
968:
967:
962:
956:
955:
950:
945:
939:
938:
933:
927:
925:
910:
909:
907:
906:
900:
899:
894:
889:
884:
879:
874:
869:
863:
862:
857:
852:
847:
842:
837:
832:
827:
822:
816:
815:
810:
805:
800:
794:
792:
781:
780:
778:
777:
772:
767:
762:
757:
751:
750:
745:
740:
735:
730:
725:
720:
714:
713:
708:
703:
698:
692:
690:
670:
669:
667:
666:
661:
656:
651:
646:
640:
639:
634:
629:
624:
619:
613:
611:
599:
598:
596:
595:
589:
588:
583:
578:
573:
568:
562:
561:
556:
551:
546:
541:
536:
531:
525:
524:
519:
514:
509:
504:
499:
494:
489:
484:
479:
474:
469:
464:
458:
457:
452:
447:
442:
437:
432:
427:
422:
417:
412:
407:
401:
400:
395:
390:
385:
380:
375:
370:
365:
360:
355:
350:
345:
340:
334:
333:
326:
325:
320:
315:
310:
305:
300:
295:
290:
285:
279:
277:
273:
272:
267:
265:
264:
257:
250:
242:
236:
235:
230:
225:
220:
213:
212:External links
210:
209:
208:
201:
194:
186:
183:
114:is refined to
108:
107:
98:
89:
80:
52:trailing truck
48:driving wheels
29:Whyte notation
15:
13:
10:
9:
6:
4:
3:
2:
1124:
1113:
1110:
1108:
1105:
1104:
1102:
1087:
1084:
1082:
1079:
1077:
1073:
1072:
1069:
1063:
1060:
1058:
1055:
1053:
1050:
1048:
1045:
1044:
1042:
1040:
1036:
1030:
1027:
1025:
1022:
1021:
1018:
1015:
1013:
1010:
1008:
1005:
1004:
1001:
998:
996:
993:
992:
990:
987:
983:
979:
973:
970:
969:
966:
963:
961:
960:2-8-8-8-8-8-2
958:
957:
954:
951:
949:
946:
944:
941:
940:
937:
934:
932:
929:
928:
926:
923:
919:
915:
911:
905:
902:
901:
898:
895:
893:
890:
888:
885:
883:
880:
878:
875:
873:
870:
868:
865:
864:
861:
858:
856:
853:
851:
848:
846:
843:
841:
838:
836:
833:
831:
828:
826:
823:
821:
818:
817:
814:
811:
809:
806:
804:
801:
799:
796:
795:
793:
790:
786:
782:
776:
773:
771:
768:
766:
763:
761:
758:
756:
753:
752:
749:
746:
744:
741:
739:
736:
734:
731:
729:
726:
724:
721:
719:
716:
715:
712:
709:
707:
704:
702:
699:
697:
694:
693:
691:
688:
683:
679:
675:
671:
665:
662:
660:
657:
655:
652:
650:
647:
645:
642:
641:
638:
635:
633:
630:
628:
625:
623:
620:
618:
615:
614:
612:
609:
604:
603:Divided drive
600:
594:
591:
590:
587:
584:
582:
579:
577:
574:
572:
569:
567:
564:
563:
560:
557:
555:
552:
550:
547:
545:
542:
540:
537:
535:
532:
530:
527:
526:
523:
520:
518:
515:
513:
510:
508:
505:
503:
500:
498:
495:
493:
490:
488:
485:
483:
480:
478:
475:
473:
470:
468:
465:
463:
460:
459:
456:
453:
451:
448:
446:
443:
441:
438:
436:
433:
431:
428:
426:
423:
421:
418:
416:
413:
411:
408:
406:
403:
402:
399:
396:
394:
391:
389:
386:
384:
381:
379:
376:
374:
371:
369:
366:
364:
361:
359:
356:
354:
351:
349:
346:
344:
341:
339:
336:
335:
331:
328:
327:
324:
321:
319:
316:
314:
311:
309:
306:
304:
301:
299:
296:
294:
291:
289:
286:
284:
281:
280:
278:
274:
270:
263:
258:
256:
251:
249:
244:
243:
240:
234:
231:
229:
226:
224:
221:
219:
216:
215:
211:
206:
202:
199:
195:
192:
189:
188:
184:
182:
180:
176:
171:
169:
165:
160:
158:
154:
153:dieselization
150:
145:
143:
138:
135:
131:
127:
122:
120:
113:
106:
102:
99:
97:
93:
90:
88:
84:
81:
78:
74:
67:
64:
63:
62:
59:
57:
53:
49:
45:
44:leading truck
41:
37:
34:
30:
21:
834:
610:engine types
204:
203:Wrinn, Jim,
197:
172:
161:
146:
139:
123:
115:
109:
104:
95:
86:
69:
60:
39:
26:
943:2-8-8-8-8-2
775:4-8-4+4-8-4
770:4-8-2+2-8-4
765:4-8-0+0-8-4
760:2-8-2+2-8-2
755:2-8-0+0-8-2
748:4-6-4+4-6-4
743:4-6-2+2-6-4
738:4-6-0+0-6-4
733:2-6-2+2-6-2
728:2-6-0+0-6-2
723:0-6-2+2-6-0
718:0-6-0+0-6-0
711:4-4-2+2-4-4
706:2-4-2+2-4-2
701:2-4-0+0-4-2
696:0-4-0+0-4-0
1101:Categories
1062:Willamette
920:and other
332:(monorail)
185:References
936:2-8-8-8-4
931:2-8-8-8-2
922:Multiplex
904:2-10-10-2
134:fireboxes
632:2-2-4-0T
1057:Heisler
1017:0-6-4-0
986:Engerth
918:Triplex
897:4-8-8-4
892:4-8-8-2
887:2-8-8-4
882:2-8-8-2
877:2-8-8-0
872:0-8-8-0
867:0-8-6-0
860:4-6-6-4
855:4-6-6-2
850:4-4-6-2
845:2-6-8-0
840:2-6-6-6
835:2-6-6-4
830:2-6-6-2
825:2-6-6-0
820:0-6-6-0
813:2-4-4-2
808:2-4-4-0
803:0-4-4-2
798:0-4-4-0
687:Garratt
678:Fairlie
664:4-6-4-4
659:4-4-6-4
654:6-4-4-6
649:4-4-4-4
644:2-4-6-2
637:4-2-2-0
627:2-2-2-2
622:2-2-2-0
617:0-2-2-0
343:0-4-0+4
207:(2000).
168:A class
116:(1'C)C2
105:3/4+3/5
87:130+032
70:(1'C)C2
40:2-6-6-4
27:In the
1052:Climax
789:Mallet
608:Duplex
593:4-14-4
586:4-12-2
581:2-12-4
576:2-12-2
571:2-12-0
566:0-12-0
559:4-10-2
554:4-10-0
549:2-10-4
544:2-10-2
539:2-10-0
534:0-10-2
529:0-10-0
472:0-8-4T
440:2-6-6T
420:0-6-6T
378:2-4-6T
373:2-4-4T
358:0-4-6T
353:0-4-4T
318:4-2-4T
303:2-2-4T
1081:Swiss
1029:0-8-6
1024:0-8-4
1012:0-6-4
1007:2-6-4
1000:0-4-6
995:0-4-4
988:types
924:types
791:types
689:types
682:Meyer
522:6-8-6
517:4-8-6
512:4-8-4
507:4-8-2
502:4-8-0
497:2-8-6
492:2-8-4
487:2-8-2
482:2-8-0
477:0-8-6
467:0-8-2
462:0-8-0
455:4-6-4
450:4-6-2
445:4-6-0
435:2-6-4
430:2-6-2
425:2-6-0
415:0-6-4
410:0-6-2
405:0-6-0
398:4-4-6
393:4-4-4
388:4-4-2
383:4-4-0
368:2-4-2
363:2-4-0
348:0-4-2
338:0-4-0
330:0-3-0
323:6-2-0
313:4-2-2
308:4-2-0
298:2-2-2
293:2-2-0
288:0-2-4
283:0-2-2
118:'
96:34+35
72:'
1047:Shay
685:and
605:and
110:The
38:, a
1086:UIC
1076:AAR
166:'s
1103::
680:,
181:.
103::
94::
85::
68::
58:.
261:e
254:t
247:v
193:.
79:)
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