29:
561:
41:
598:). For this reason, the drive selector on the Class 127 was fitted with positions marked "D, 3, 2, 1" to change the gears when working in formation with vehicles with mechanical transmission. However, because of damage to mechanical transmissions caused by improper gear selection on coupled hydraulic units, the Class 127 units had their coupling code changed from Blue Square to Red Triangle, which differed from Blue Square in name only and was unrelated to an earlier Red Triangle code used for the
104:
In the early days of diesel locomotives in the 1960s, locomotives worked within their class (i.e. two locomotives of the same class could work together but not with other classes). Locomotives from different manufacturers had varying methods of controlling engines or
575:
79:
If the front locomotive of a pair in multiple has failed the driver can still control the rear locomotive for as long as air and electricity supplies are available on the failed locomotive.
998:
960:
131:
of the rearmost locomotive. The doors actually saw little use and, as they frequently caused draughts in the cab, many of them were later welded shut.
979:
748:
were fitted with BSI couplers enabling them to operate in multiple with older stock, while other incompatible systems emerged. Examples included
1068:
83:
Many main-line diesel-electric and hydraulic locomotives are capable of running in multiples of up to three under the control of one driver
887:
96:
is when more than one diesel or electric locomotive are hauling a single train and under the control of a driver on each locomotive.
116:
Since then, locomotives have been built to work with other locomotives in the same code or system. Similar systems are assigned a
648:
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8:
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72:) are coupled together in such a way that they are all under the control of one driver (
721:
123:
Early diesels were also fitted with communicating doors in the nose which allowed the
28:
1040:
1033:
British
Railways Locomotives and Multiple Units including Preserved Locomotives 1977
560:
937:
749:
1002:
983:
964:
892:
875:
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40:
1057:
830:
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106:
16:
This article is about UK train operations specifically. For other uses, see
717:
110:
578:
diesel multiple units had the additional problem of differing types of
124:
816:
use fleets with a number of incompatible multiple working systems.
120:, which is normally indicated on the front of the locomotive.
109:. If a train required more than one locomotive, an additional
812:. Franchise changes and stock reallocation means that many
1030:
88:
British
Railways Diesel Traction Manual for Enginemen,
724:
multiple working system, including members of the 14x
856:
British
Railways Diesel Traction Manual for Enginemen
935:
913:
888:"Built in the 1960sā¦ rebuilt for the 21st century"
858:. British Transport Commission. 1962. p. 184.
64:is where two or more traction units (locomotives,
1055:
23:Several locomotives running with a single driver
590:) could be required to work in multiple with a
52:locomotive being coupled for multiple working
665:Derby Lightweight (hydraulic transmission)
32:Blue Star multiple working equipment on a
836:
625:Most units with mechanical transmission,
1031:Williams, Alan; Percival, David (1977).
559:
39:
27:
1056:
716:Most second-generation units built by
605:First-generation DMU coupling codes:
1069:Rail transport in the United Kingdom
711:
555:
331:Symbol re-used for different system
298:Symbol re-used for different system
13:
14:
1080:
544:
404:Mark One Electric Multiple Units
1008:
989:
970:
951:
929:
907:
880:
862:
848:
113:was needed, at extra expense.
99:
1:
841:
7:
938:"Class 127 DMU Description"
826:Multiple-unit train control
819:
647:(mechanical transmission),
283:Diesel hydraulic - 1st use
220:(under diesel power only),
74:multiple-unit train control
18:Multiple-unit train control
10:
1085:
1024:
548:
224:(under diesel power only)
15:
1064:Rail transport operations
936:The Railcar Association.
916:"Class 127 DMU Interiors"
914:The Railcar Association.
814:train operating companies
720:were designed to use the
649:Metro-Cammell Lightweight
535:, plus several converted
308:
276:
364:Class 43 (Warship Class)
291:Class 41 (Warship Class)
874:1 February 2008 at the
699:Red Triangle (2nd use)
662:Red Triangle (1st use)
596:mechanical transmission
421:AC electric locomotives
70:electric multiple units
837:References and sources
588:hydraulic transmission
572:
91:
53:
37:
563:
439:Within own class only
143:Class of locomotives
81:
66:diesel multiple units
43:
31:
1001:4 March 2016 at the
982:4 March 2016 at the
963:13 June 2020 at the
129:train heating boiler
736:trains such as the
571:working in multiple
484:, Push-Pull fitted
869:US Loco MU Control
734:post-privatisation
582:. For instance, a
573:
245:(Nos D6100-6137),
172:(Nos D6138-6157),
164:(Nos D8588ā8616),
154:Electro-pneumatic
54:
38:
712:Second-generation
709:
708:
645:Derby Lightweight
600:Derby Lightweight
542:
541:
376:Diesel hydraulic
352:Diesel hydraulic
320:(nos 10000/10001)
235:Electro-magnetic
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905:
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900:
884:
878:
866:
860:
859:
852:
750:Dellner-couplers
698:
685:
672:
661:
640:
621:
608:
607:
576:First-generation
556:First-generation
440:
422:
373:Yellow Triangle
372:
358:(D6306 - 6357),
348:
311:
289:(D6300 - 6305),
279:
263:
231:
150:
134:
133:
89:
62:multiple working
1084:
1083:
1079:
1078:
1077:
1075:
1074:
1073:
1054:
1053:
1047:
1027:
1022:
1021:
1013:
1009:
1003:Wayback Machine
994:
990:
984:Wayback Machine
975:
971:
965:Wayback Machine
956:
952:
942:
940:
934:
930:
920:
918:
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908:
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885:
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876:Wayback Machine
867:
863:
854:
853:
849:
844:
839:
822:
804:were fitted to
732:families. Some
714:
696:
683:
670:
659:
641:Yellow Diamond
638:
619:
558:
553:
547:
438:
420:
370:
346:
321:
309:
277:
261:
229:
148:
107:braking systems
102:
90:
87:
58:UK rail network
24:
21:
12:
11:
5:
1082:
1072:
1071:
1066:
1052:
1051:
1045:
1035:. Shepperton:
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623:
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612:
611:Coupling code
557:
554:
549:Main article:
546:
545:Multiple units
543:
540:
539:
506:
500:
497:
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463:
458:
455:
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444:Class 43 (HST)
441:
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418:
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389:
388:SR EMU System
386:
383:
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377:
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367:
366:
353:
350:
349:White Diamond
343:
342:
333:
327:
326:
325:(D8500āD8587)
315:
313:
306:
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294:
293:
284:
281:
280:Orange Square
274:
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258:
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236:
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226:
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155:
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145:
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127:to access the
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22:
9:
6:
4:
3:
2:
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1046:0-7110-0751-9
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865:
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851:
847:
832:
831:Multiple unit
829:
827:
824:
823:
817:
815:
811:
807:
803:
802:Scharfenbergs
799:
795:
791:
787:
783:
779:
775:
771:
767:
763:
759:
755:
751:
747:
743:
739:
735:
731:
727:
723:
719:
704:
701:
695:
694:
691:
688:
686:White Circle
682:
681:
678:
675:
669:
668:
664:
658:
657:
654:
650:
646:
643:
637:
636:
633:(until 1969)
632:
628:
624:
618:
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610:
609:
606:
603:
601:
597:
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589:
585:
581:
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566:
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552:
551:Multiple unit
538:
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285:
282:
275:
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268:
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264:Green Circle
260:
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228:
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147:
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137:Coupling code
136:
135:
132:
130:
126:
121:
119:
118:coupling code
114:
112:
108:
97:
95:
84:
80:
77:
75:
71:
67:
63:
59:
51:
47:
42:
35:
30:
26:
19:
1032:
1017:Angel Trains
1010:
1005:Angel Trains
991:
986:Angel Trains
972:
967:Angel Trains
953:
941:. Retrieved
931:
919:. Retrieved
909:
897:. Retrieved
891:
882:
864:
855:
850:
718:British Rail
715:
705:(from 1969)
673:Orange Star
622:Blue Square
604:
602:hydraulics.
580:transmission
574:
330:
312:Red Diamond
297:
122:
117:
115:
103:
93:
92:
82:
78:
61:
55:
25:
318:Class D16/1
232:Red Circle
100:Locomotives
1058:Categories
899:20 January
842:References
752:fitted to
461:TDM System
392:Class 33/1
255:Class 31/0
190:Class 31/1
151:Blue Star
36:locomotive
1037:Ian Allan
1015:Class 180
996:Class 175
977:Class 390
958:Class 172
943:12 August
921:12 August
806:Class 175
754:Class 171
738:Class 168
703:Class 127
690:Class 126
677:Class 125
653:Class 129
631:Class 127
627:Class 113
592:Class 112
584:Class 127
569:Class 150
565:Class 153
523:008ā015,
452:Class 68s
430:Class 86s
412:Class 489
408:Class 442
271:Class 47s
125:secondman
94:In tandem
999:Archived
980:Archived
961:Archived
872:Archived
820:See also
730:Sprinter
728:and 15x
505:System
486:Class 47
482:Class 91
478:Class 90
474:Class 89
470:Class 87
466:Class 86
448:Class 60
426:Class 87
400:Class 74
396:Class 73
380:Class 35
360:Class 42
356:Class 22
340:Class 58
336:Class 56
323:Class 17
303:Class 50
287:Class 22
251:Class 29
247:Class 28
243:Class 21
239:Class 16
222:Class 74
218:Class 73
214:Class 46
210:Class 45
206:Class 44
202:Class 40
198:Class 37
194:Class 33
186:Class 27
182:Class 26
178:Class 25
174:Class 24
170:Class 21
166:Class 20
162:Class 17
158:Class 15
86:ā
50:Class 33
46:Class 73
34:Class 40
1025:Sources
450:, some
428:, some
56:On the
1043:
800:while
614:Class
594:unit (
586:unit (
531:, and
140:System
111:driver
48:and a
726:Pacer
269:Some
1041:ISBN
945:2023
923:2023
901:2020
893:Rail
810:180s
808:and
798:710s
796:and
746:172s
744:and
567:and
537:DVTs
533:73/9
490:DBSO
794:700
790:390
786:377
782:376
778:375
774:360
770:350
766:222
762:221
758:220
742:170
722:BSI
503:AAR
494:DVT
76:).
68:or
1060::
1039:.
890:.
792:,
788:,
784:,
780:,
776:,
772:,
768:,
764:,
760:,
756:,
740:,
651:,
629:,
529:70
527:,
525:69
521:68
519:,
517:67
515:,
513:66
511:,
509:59
492:,
488:,
480:,
476:,
472:,
468:,
446:,
410:,
406:,
402:,
398:,
394:,
362:,
338:,
253:,
249:,
241:,
216:,
212:,
208:,
204:,
200:,
196:,
192:,
188:,
184:,
180:,
176:,
168:,
160:,
60:,
44:A
1049:.
947:.
925:.
903:.
697:ā²
684:ā
671:ā
660:ā²
639:ā
620:ā
371:ā²
347:ā
310:ā
278:ā
262:ā
230:ā
149:ā
20:.
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
