129:
464:
456:
32:
177:
540:(lettered trains). To allow trains to proceed it pivots down. A trip cock is mounted on the corner of the truck (bogie) of each car. The placement of the trip cock depends on the division the train runs on; some rolling stock is equipped with a trip cock on both sides. The train stop can be identified on the tracks because they are painted yellow for evidence if it has ever tripped a train.
303:, the trip arm is lowered, and a train is able to proceed without further hindrance. In some cases, the trip arm will not be lowered when the signal to which it applies is exhibiting a proceed indication, e.g. when subsidiary signals are cleared, forcing a train to trip before proceeding, thus ensuring that movements are conducted at safe speeds.
467:
471:
470:
466:
465:
472:
469:
270:
has been deployed as it is widely used on the New York City Subway, where a second trip arm at a distance is folded down only a few seconds after a train has passed a check point. These expensive speed control systems are generally phased out in favour of a cab control computer that can continuously
253:
Because the trip arm may hit the brake lever directly, there have been installations where every wagon of a train has a separate trip cock on each bogie that has brakes. Hence in some installations the trip arm will be folded back to the safe position only a few seconds after a signal has turned red
658:
shows a train stop being struck by a New York City elevated subway train as it approaches the train ahead of it on the same track. Although the moving train hits the train stop and begins to slow down, for the purposes of the film sequence, it was supposedly traveling too fast to reach a full stop
241:
The mechanical train stops have been found to be relatively safe with their historic models from the 19th century to be still in use in the 21st century. Because of the quadratic force increments in relation to speed these mechanical systems are restricted to low speed applications. Their continued
315:
on the approach for a period of time corresponding to a set speed. If the train approaches at a speed higher than the one that is set, the trip arm remains raised and trips the train to a stop. If the train approaches at a speed equal to or lower than the set speed, the trip arm lowers before the
615:
The mechanical trip arm is proved in the lowered position before the red light of its associated signal is extinguished. The trip arm is proved in the raised position before the track circuit following that signal is indicated as unoccupied. The proving switch detects the actual arm of the train
326:
For sections of track with lower speed limits (15–20 km/h) a simpler construction is also used. The trip arm rotates freely on a horizontal axis with a counterbalance attached to its lower end. If a train's speed is low, the arm will be rotated by the trip cock with a force insufficient to
347:
A fixed train stop that is the last one on a running line in the reverse direction may, despite its name, be suppressed, as is the case with the associated "Fixed
Signals" on the Sydney network. Suppression is needed because in Sydney, the rear trip cock on a train is always lowered, while in
215:
provision in case of failure of the electric or pneumatic power supply or of the motor driving the trip arm. If a train attempts to pass the signal with the trip arm in the raised position, the trip arm makes mechanical contact with the trip cock on the train, causing the train's brakes to be
339:
With fixed train stops, the trip arm cannot be lowered. Fixed stops are positioned close to the end of a dead-end track, to stop a train before it runs out of track. They may also be used at the end of track sections beyond which certain trains should not pass, such as the end of electrified
624:
When the signalling fails, etc., it may be necessary to "trip past" a train stop in the danger position, in accordance with the rules. With the train now working "on sight" it is important to travel at a low speed. If low speed is not maintained, then accidents can occur, such as
498:
underground railway used a metal stick as a trip arm, which hung over the track horizontally like a semaphore signal. The trip cock was on the roof of the first wagon (near the first door) almost looking like a lightning rod. The system was phased out in the 1960s
233: in (64 mm) above the top of the running rail when in the stop position, and lower to approximately 1 in (25 mm) below the top of the running rail when clear. The time taken for the arm to rise or be lowered is approximately two seconds.
298:
The trip arm is raised whenever the signal is not displaying a proceed aspect. If a train tries to pass the signal, the trip cock on the train strikes the raised trip arm and the train is brought to a halt. When the signal indicates it is safe to proceed
387:
Because of its mechanical nature, the train stop has certain limitations in application. Severe snow and ice conditions, for example, could interfere with operation of the wayside trip arm. Its widest application, therefore, is on underground
265:
Like many early systems a mechanical train stop does not inherently control speed. There were accidents where trains had overrun the overlap due to excessive speed. In order to externally control the speed of a train the operation of
206:
The trip arm is raised automatically whenever a train should be brought to a halt. When the signalling system determines it is safe for the train to proceed, the motor drives the trip arm down to the lowered position. The
468:
242:
usage can be found in urban rapid transit systems with trains making no more than 100 km/h. Whereas later contactless train stops require a working receiver on the train to initiate the emergency stop (as for
355:
Some railways and rail transit agencies use fixed train stops to protect workers in work zones by temporarily applying them at either end of the zone, preventing trains from incorrectly entering the work zone.
584:
In Sydney, the rear trip is always lowered, and trip arms in the opposite direction are "suppressed" so that they do not engage the rear trip cock. Trip cocks on intermediate cars, if any, are always raised.
564:
also uses a T-shaped metal bar that rises from the floor except it is always on the right side of the track for all rolling stock because the trip cock is placed on the right side for all rolling stock.
591:), it will automatically drive the trip arms which apply to the other direction. This is necessary because trip cocks are located along the entire length of trains in New York, not just the lead car.
573:
When trains operate in the reverse direction, they may "back trip" on train stops applying to the normal direction, which is a nuisance. This may be avoided in one of three ways:
513:
underground railway used a mushroom-shaped swivel next to the right rail as a trip arm. The trip cock was mounted on the first bogie. This system was replaced likewise.
843:
526:
use a semi-circle that rotates into position when signals are red. All of them are on the right side of tracks as trains' trip cocks are fitted on the right side.
488:, on which the trip cock is placed. The metal bar (also named "Streckenanschlag" / track stop collar) folds away to allow passing. It is being replaced by
635:
790:
554:, except that it is mirror-image mounted on the left hand side of the track instead of the right hand side. A nearly identical system is used in
262:). Because of wear the trip arms for the opposite direction on the same rail will be actuated along with the trip arm for the nominal direction.
758:
168:
when the signal aspect and operating rules prohibit such movement, or (in some applications) if it attempts to pass at an excessive speed.
352:, by contrast, suppression is not required because the trip cock at the rear of a train is always raised clear of any wayside trip arm.
818:
341:
344:), or to test the automatic brake and tripgear of trains departing certain locations, e.g. storage sidings, near buffer stops.
920:
489:
440:
721:
187:
The train stop system comprises two basic components. One is the trip arm mechanism, mounted on the ground adjacent to the
675:
96:
851:
616:
stop, and breakage of that arm centres the switch neither depressed nor normal thus alerting operators to its failure.
68:
1418:
537:
533:
259:
115:
844:"Runaway of Suburban Electric Passenger Train 5264 and collision with Diesel Locomotive Hauled Passenger Train 8141"
1393:
629:
75:
581:
the rear trip cock is raised, although this runs the risk of runaways from terminal stations at high elevations.
53:
587:
In New York, when the signalling system clears motion in one direction (on bi-directional track or through an
82:
1001:
653:
495:
425:
49:
930:
510:
669:
396:
380:
and other transit systems in the United States. Similar systems were installed around this time on the
64:
532:
uses a T-shaped metal bar rising from the floor as a trip arm; on the right side of the track for the
1116:
913:
519:
uses a square-shaped metal plate that functions similarly to that on the New York City Subway system.
1350:
403:
metropolitan passenger lines in New South Wales, and on the electrified suburban railway system in
243:
884:
1388:
1101:
942:
640:
373:
365:
157:
42:
1260:
1084:
1016:
439:
system with third-rail electrification in
Germany. They are being phased out in favour of the
327:
initiate braking. But if its speed is too high, force will be large due to the counterbalance
1240:
1220:
986:
578:
404:
349:
311:
With a timed train stop, the trip arm stays raised until the approaching train has shunted a
410:
The Train stops at the Berlin S-Bahn were first installed in the late 1920s. They are named
1190:
906:
691:
529:
392:
lines, where conditions that might interfere with proper operation are readily controlled.
377:
369:
195:(or pneumatic cylinder in electro-pneumatic systems). The other is the train-mounted trip
8:
1265:
1037:
773:
878:
89:
19:
This article is about the train protection device. For the place where trains stop, see
1373:
1310:
1296:
1250:
1180:
752:
596:
516:
381:
137:
484:
rapid transit uses a metal bar as the trip arm, positioned at the height of the first
1378:
1123:
429:
320:
395:
Train stops on London
Underground lines are gradually being phased out in favour of
1335:
1305:
1300:
971:
711:
211:
ensures that the trip arm is raised in all other situations, which is an essential
128:
1383:
1255:
1210:
1150:
1052:
976:
966:
600:
208:
200:
1245:
1230:
1155:
1128:
1057:
716:
681:
561:
192:
165:
1412:
1345:
1340:
1330:
1291:
1235:
1143:
1138:
1106:
1089:
956:
938:
481:
436:
389:
323:
to acknowledge a stimulus before the trip arm is lowered on a yellow signal.
312:
181:
20:
476:
A train stop of New York City Subway, just north of the 125th street station
455:
399:
and distance-to-go signalling. Train stops remain standard equipment on all
1275:
1225:
1205:
1165:
1067:
1047:
1032:
1011:
1006:
996:
686:
588:
523:
316:
train arrives, and the train is able to proceed without further hindrance.
219:
Wayside trip arms are adjusted so that they rise to a point approximately
1200:
1160:
1072:
504:
500:
188:
250:) the mechanical stops have initially been kicking the brakes directly.
1357:
1323:
1318:
1195:
1170:
1111:
1077:
961:
604:
555:
444:
433:
898:
603:
facing the opposite direction of travel. This is because they protect
1096:
1062:
1042:
991:
981:
212:
199:, which is connected either directly or electrically to the train's
191:, which essentially consists of a spring-loaded arm connected to an
31:
1133:
951:
400:
176:
607:
that often travel in opposite direction during engineering works.
132:
A signal with associated trip arm in the raised position (circled)
328:
850:. Australian Transport Safety Bureau. 2003-07-25. Archived from
1215:
701:
696:
543:
247:
485:
216:
automatically applied, thereby bringing the train to a halt.
196:
161:
745:
Automatic Block
Signalling for Interurban Electric Railways
742:
289:
Fixed train stop - prevents any trains from passing a point
255:
180:
Train-mounted trip cock, located on the leading bogie of a
705:
424:) because of their testing and first installation on the
791:"Die mechanische Zugsicherung bei der Berliner U-Bahn"
776:. 2011-07-03. Punkt 3 - Ausgabe 14 - Bauen - Seite 12.
819:"Die magnetische Fahrsperre bei der Berliner U-Bahn"
56:. Unsourced material may be challenged and removed.
877:Richey, Albert S. (1915). "Automatic Train Stop".
271:check a braking curve while approaching a signal.
258:(which is an actual security risk as shown in the
507:) and replaced by an inductive train stop system.
283:Trip stop - stops train trying to pass red signal
1410:
785:
783:
619:
813:
811:
286:Timed train stop - stops train moving too fast
914:
780:
419:
412:
808:
921:
907:
757:: CS1 maint: location missing publisher (
652:The car chase scene in the motion picture
678:- does not enforce a stop at a red signal
450:
116:Learn how and when to remove this message
891:General Railway Signal Co. (June 1979).
848:Rail safety investigations & reports
536:(numbered trains) and left side for the
462:
454:
175:
127:
928:
659:before colliding with the train ahead.
274:
1411:
876:
376:. This system was soon adopted by the
279:There are three types of train stops:
267:
902:
722:Train Protection & Warning System
546:now uses the London Underground type
774:"Wenn auf dem Ostring gebaut wird …"
743:Union Switch and Signal Co. (1911).
568:
334:
331:, causing the brakes to be applied.
306:
54:adding citations to reliable sources
25:
319:Some timed train stops require the
13:
883:. New York: McGraw-Hill. pp.
869:
599:there are many train stops on the
171:
160:device that automatically stops a
14:
1430:
260:1995 Russell Hill subway accident
708:- German train protection system
359:
30:
366:Union Switch and Signal Company
236:
41:needs additional citations for
836:
766:
736:
1:
893:Elements of Railway Signaling
729:
293:
747:. Swissvale, PA. p. 33.
647:
636:Berala train collision, 1952
620:Tripping past, and accidents
7:
662:
511:Berlin U-Bahn large profile
496:Berlin U-Bahn small profile
459:Train stop of Berlin S-Bahn
10:
1435:
1129:Transfer table (traverser)
670:Automatic train protection
610:
18:
1366:
1284:
1179:
1117:ground-level power supply
1025:
937:
880:Electric Railway Handbook
164:if it attempts to pass a
1419:Train protection systems
676:Automatic warning system
428:to the suburban town of
421:Fahrsperre Bauart Bernau
1102:Railway electrification
823:Berliner Verkehrsseiten
795:Berliner Verkehrsseiten
641:Glenbrook rail accident
503:), respectively 1990s (
374:Boston Elevated Railway
477:
460:
451:Trackside installation
420:
413:
184:
133:
1241:Platform screen doors
655:The French Connection
522:Several lines on the
475:
458:
432:. This was the first
179:
131:
16:Railway safety device
1191:Anti-trespass panels
550:trip arm called the
530:New York City Subway
378:New York City Subway
370:automatic train stop
368:developed the first
275:Types of train stops
152:(sometimes called a
50:improve this article
1038:Classification yard
630:Roseville collision
414:Bernauer Fahrsperre
254:in order to reduce
1297:Motive power depot
1251:Signalling control
597:London Underground
517:London Underground
478:
461:
382:London Underground
301:(clear or caution)
185:
138:railway signalling
134:
1406:
1405:
1124:Railway turntable
945:
692:Dead man's switch
605:engineer's trains
569:Reverse direction
473:
335:Fixed train stops
307:Timed train stops
268:timed train stops
126:
125:
118:
100:
1426:
1301:Railway workshop
1017:Transition curve
987:Fastening system
941:
923:
916:
909:
900:
899:
888:
863:
862:
860:
859:
840:
834:
833:
831:
830:
815:
806:
805:
803:
802:
787:
778:
777:
770:
764:
763:Bulletin No. 57.
762:
756:
748:
740:
712:Moorgate control
474:
443:system based on
423:
416:
340:territory (e.g.
232:
231:
227:
224:
158:train protection
121:
114:
110:
107:
101:
99:
58:
34:
26:
1434:
1433:
1429:
1428:
1427:
1425:
1424:
1423:
1409:
1408:
1407:
1402:
1362:
1280:
1256:Structure gauge
1211:Defect detector
1183:
1175:
1021:
977:Clip and scotch
967:Breather switch
933:
927:
897:
872:
870:Further reading
867:
866:
857:
855:
842:
841:
837:
828:
826:
817:
816:
809:
800:
798:
789:
788:
781:
772:
771:
767:
750:
749:
741:
737:
732:
727:
665:
650:
622:
613:
601:Piccadilly line
571:
463:
453:
426:Stettin Railway
372:system for the
362:
337:
309:
296:
277:
239:
229:
225:
222:
220:
174:
172:Basic operation
122:
111:
105:
102:
59:
57:
47:
35:
24:
17:
12:
11:
5:
1432:
1422:
1421:
1404:
1403:
1401:
1400:
1399:
1398:
1397:
1396:
1381:
1376:
1370:
1368:
1364:
1363:
1361:
1360:
1355:
1354:
1353:
1348:
1343:
1338:
1328:
1327:
1326:
1321:
1313:
1308:
1303:
1294:
1288:
1286:
1282:
1281:
1279:
1278:
1273:
1268:
1263:
1258:
1253:
1248:
1246:Railway signal
1243:
1238:
1233:
1231:Level crossing
1228:
1223:
1218:
1213:
1208:
1203:
1198:
1193:
1187:
1185:
1177:
1176:
1174:
1173:
1168:
1163:
1158:
1156:Track geometry
1153:
1148:
1147:
1146:
1136:
1131:
1126:
1121:
1120:
1119:
1114:
1109:
1107:overhead lines
1099:
1094:
1093:
1092:
1082:
1081:
1080:
1070:
1065:
1060:
1058:Gauntlet track
1055:
1050:
1045:
1040:
1035:
1029:
1027:
1023:
1022:
1020:
1019:
1014:
1009:
1004:
1002:Minimum radius
999:
994:
989:
984:
979:
974:
969:
964:
959:
954:
948:
946:
935:
934:
931:infrastructure
926:
925:
918:
911:
903:
896:
895:
889:
873:
871:
868:
865:
864:
835:
807:
779:
765:
734:
733:
731:
728:
726:
725:
719:
717:Railway signal
714:
709:
699:
694:
689:
684:
682:Cab signalling
679:
673:
666:
664:
661:
649:
646:
645:
644:
638:
633:
621:
618:
612:
609:
593:
592:
585:
582:
570:
567:
566:
565:
562:Toronto Subway
559:
541:
527:
520:
514:
508:
493:
452:
449:
361:
358:
336:
333:
308:
305:
295:
292:
291:
290:
287:
284:
276:
273:
238:
235:
201:braking system
193:electric motor
173:
170:
124:
123:
38:
36:
29:
15:
9:
6:
4:
3:
2:
1431:
1420:
1417:
1416:
1414:
1395:
1392:
1391:
1390:
1387:
1386:
1385:
1382:
1380:
1377:
1375:
1372:
1371:
1369:
1365:
1359:
1356:
1352:
1349:
1347:
1344:
1342:
1339:
1337:
1334:
1333:
1332:
1329:
1325:
1322:
1320:
1317:
1316:
1314:
1312:
1309:
1307:
1304:
1302:
1298:
1295:
1293:
1292:Coaling tower
1290:
1289:
1287:
1283:
1277:
1274:
1272:
1269:
1267:
1264:
1262:
1261:Signal bridge
1259:
1257:
1254:
1252:
1249:
1247:
1244:
1242:
1239:
1237:
1236:Loading gauge
1234:
1232:
1229:
1227:
1224:
1222:
1219:
1217:
1214:
1212:
1209:
1207:
1204:
1202:
1199:
1197:
1194:
1192:
1189:
1188:
1186:
1182:
1178:
1172:
1169:
1167:
1164:
1162:
1159:
1157:
1154:
1152:
1149:
1145:
1144:refuge siding
1142:
1141:
1140:
1137:
1135:
1132:
1130:
1127:
1125:
1122:
1118:
1115:
1113:
1110:
1108:
1105:
1104:
1103:
1100:
1098:
1095:
1091:
1090:tramway track
1088:
1087:
1086:
1083:
1079:
1076:
1075:
1074:
1071:
1069:
1066:
1064:
1061:
1059:
1056:
1054:
1051:
1049:
1046:
1044:
1041:
1039:
1036:
1034:
1031:
1030:
1028:
1024:
1018:
1015:
1013:
1010:
1008:
1005:
1003:
1000:
998:
995:
993:
990:
988:
985:
983:
980:
978:
975:
973:
970:
968:
965:
963:
960:
958:
955:
953:
950:
949:
947:
944:
940:
936:
932:
924:
919:
917:
912:
910:
905:
904:
901:
894:
890:
886:
882:
881:
875:
874:
854:on 2013-10-25
853:
849:
845:
839:
824:
820:
814:
812:
796:
792:
786:
784:
775:
769:
760:
754:
746:
739:
735:
723:
720:
718:
715:
713:
710:
707:
703:
700:
698:
695:
693:
690:
688:
685:
683:
680:
677:
674:
671:
668:
667:
660:
657:
656:
642:
639:
637:
634:
631:
628:
627:
626:
617:
608:
606:
602:
598:
590:
586:
583:
580:
576:
575:
574:
563:
560:
557:
553:
549:
545:
542:
539:
535:
531:
528:
525:
521:
518:
515:
512:
509:
506:
502:
497:
494:
491:
487:
483:
482:Berlin S-Bahn
480:
479:
457:
448:
446:
442:
438:
437:rapid transit
435:
431:
427:
422:
417:
415:
408:
407:, Australia.
406:
402:
398:
393:
391:
390:rapid transit
385:
383:
379:
375:
371:
367:
360:Installations
357:
353:
351:
345:
343:
342:Hamilton, NSW
332:
330:
324:
322:
317:
314:
313:track circuit
304:
302:
288:
285:
282:
281:
280:
272:
269:
263:
261:
257:
251:
249:
245:
234:
217:
214:
210:
204:
202:
198:
194:
190:
183:
178:
169:
167:
163:
159:
155:
151:
147:
143:
139:
130:
120:
117:
109:
98:
95:
91:
88:
84:
81:
77:
74:
70:
67: –
66:
62:
61:Find sources:
55:
51:
45:
44:
39:This article
37:
33:
28:
27:
22:
21:Train station
1276:Wayside horn
1270:
1226:Interlocking
1206:Catch points
1166:Water trough
1068:Passing loop
1048:Pocket track
1033:Balloon loop
997:Ladder track
892:
879:
856:. Retrieved
852:the original
847:
838:
827:. Retrieved
822:
799:. Retrieved
794:
768:
744:
738:
687:Catch points
654:
651:
623:
614:
594:
589:interlocking
572:
551:
547:
524:Moscow Metro
447:until 2025.
411:
409:
394:
386:
363:
354:
346:
338:
325:
318:
310:
300:
297:
278:
264:
252:
240:
237:Restrictions
218:
205:
186:
153:
149:
145:
141:
135:
112:
103:
93:
86:
79:
72:
65:"Train stop"
60:
48:Please help
43:verification
40:
1201:Buffer stop
1161:Water crane
1073:Track gauge
1012:Tie/Sleeper
825:(in German)
797:(in German)
492:until 2025.
445:Eurobalises
182:Siemens EMU
1374:Industrial
1358:Water stop
1319:for trains
1311:Roundhouse
1285:Structures
1271:Train stop
1221:Guard rail
1196:Block post
1184:and safety
1181:Signalling
1112:third rail
1085:Rail track
1078:dual gauge
962:Baulk road
858:2012-08-26
829:2023-01-10
801:2023-01-10
730:References
556:Wellington
538:B Division
534:A Division
434:heavy rail
294:Trip stops
142:train stop
140:system, a
136:Part of a
76:newspapers
1324:for goods
1266:Tell-tale
1097:Rail yard
1063:Guide bar
1043:Headshunt
1026:Trackwork
992:Fishplate
982:Date nail
943:(history)
753:cite book
648:Depiction
579:Melbourne
405:Melbourne
364:In 1901,
350:Melbourne
213:fail-safe
146:trip stop
106:June 2011
1413:Category
1379:Military
1336:building
1306:Platform
1216:Derailer
1134:Roll way
1053:Junction
952:Axe ties
663:See also
401:RailCorp
384:system.
150:tripcock
1389:station
1384:Private
1331:Station
1007:Profile
957:Ballast
611:Proving
595:On the
329:inertia
228:⁄
156:) is a
154:tripper
90:scholar
1151:Switch
1139:Siding
939:Tracks
724:(TPWS)
702:Indusi
697:Derail
643:, 1999
632:, 1950
544:Sydney
430:Bernau
321:driver
248:Indusi
209:spring
166:signal
92:
85:
78:
71:
63:
1367:Types
1346:ghost
1341:clock
1315:Shed
929:Rail
887:–815.
672:(ATP)
486:bogie
162:train
97:JSTOR
83:books
1394:list
1351:list
972:Cant
759:link
505:East
501:West
418:(or
256:wear
244:PCCS
197:cock
189:rail
69:news
1171:Wye
885:813
706:PZB
704:or
577:In
490:ZBS
441:ZBS
397:ATP
246:or
148:or
52:by
1415::
846:.
821:.
810:^
793:.
782:^
755:}}
751:{{
552:JA
203:.
144:,
1299:/
922:e
915:t
908:v
861:.
832:.
804:.
761:)
558:.
548:J
499:(
230:2
226:1
223:+
221:2
119:)
113:(
108:)
104:(
94:·
87:·
80:·
73:·
46:.
23:.
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
