86:, which have a high operating friction and are subject to steam forces on both sides of the valve. This friction meant that if the Johnson Bar is unlatched while the engine is operating under high steam pressure (wide regulator openings and high cut-off) or at high speeds, the forces that are supposed to act on the slide valves can instead be transmitted back through the linkage to the now-free reversing lever. This will suddenly and violently throw the lever into the full cut-off position, carrying with it the real danger of injury to the driver, damage to the valve gear and triggering wheel slip in the locomotive. The only way to prevent this is to close the regulator and allow the steam pressure in the valve chest to drop. The reversing lever can then be unlatched and set to a new cut-off position and then the regulator could be opened again. During this process the locomotive is not under power. On ascending gradients it was a matter of great skill to reduce the regulator opening by enough to safely unlatch the Johnson Bar while maintaining sufficient steam pressure to the cylinders. Each time the regulator was re-opened was a chance to encounter wheel slip and in
75:
position of the notches is chosen by the locomotive designer or constructor with a view to the locomotive's intended purpose. In general engines designed for freight will have fewer notches with a 'longer' minimum cut-off (providing high tractive effort at low speeds but poor efficiency at high speeds) while a passenger locomotive will have more notches and a shorter minimum cut-off (allowing efficiency at high speeds at the expense of tractive effort). If the minimum cut-off provided for by the notches was too high, it would not be possible to run the locomotive in the efficient way described above (with a fully open regulator) without leading to steam wastage or 'choking' of the steam passages, so the regulator would have to be closed. That limits efficiency.
121:
139:
160:
possible. The wheel is fitted with a locking lever to prevent creep and there is an indicator to show the percentage of cutoff in use. This method of altering the cutoff offers finer control than the sector lever, but it has the disadvantage of slow operation. It is most suitable for long-distance passenger engines where frequent changes of cutoff are not required and where fine adjustments offer the most benefit. On locomotives fitted with
31:
177:
operator worked a valve that admitted steam to one side or the other of a cylinder connected to the reversing mechanism until the indicator showed the intended position. A second mechanism—usually a piston in an oil-filled cylinder held in position by closing a control cock—was required to keep the linkages in place.
54:
This is the most common form of reverser. It is also known as a
Johnson bar in the United States. It consists of a long lever mounted parallel to the direction of travel, on the driver’s side of the cab. It has a handle and sprung trigger at the top and is pivoted at the bottom to pass between two
159:
in the UK), the reversing rod is controlled by a screw and nut, worked by a wheel in the cab. The nut either operates on the reversing rod directly or through a lever, as above. The screw and nut may be cut with a double thread (aka 2-start) and a coarse pitch to move the mechanism as quickly as
176:
With larger engines, the linkages involved in controlling cutoff and direction grew progressively heavier and there was a need for power assistance in adjusting them. Steam (later, compressed air) powered reversing gears were developed in the late 19th and early 20th centuries. Typically, the
168:, it was common to use the screw housing as an air cylinder, with the nut extended to form a piston. Compressed air from the brake reservoirs was applied to one side of the piston to reduce the effort required to lift the heavy expansion link, with gravity assisting in the opposite direction.
74:
The reversing lever has a catch mechanism which engages with a series of notches to hold the lever at the desired cut-off position. This means that the operator does not have a full choice of cut-off positions between maximum and mid-gear, but only those which correspond with the notches. The
245:
mounted on a single piston rod. Both pistons are double-ended. One is a steam piston to move the rod as required. The other, containing oil, holds the rod in a fixed position when the steam is turned off. Control is by a small three-way steam valve (“forward”, “stop”, “back”) and a separate
271:
was explicitly used by the developers of some later power reverse mechanisms. The use of feedback control in these later power reverse mechanisms eliminated the need for a second cylinder for a hydraulic locking mechanism, and it restored the simplicity of a single operating lever that both
267:. The power reverse amplified small motions of the reversing lever made in the locomotive cab with modest force into much larger and more forceful motions of the reach rod that controlled the engine cutoff and direction. It was usually air powered, but could also be steam powered. The term
107:. For switching, which required frequent changes of direction from full-ahead to full-reverse gear, the Johnson Bar was favored because the change could be made quickly in a single motion instead of the multiple turns of the handle of a low-geared screw reverser.
103:. From 1939 all new-build steam locomotives had to be fitted with power reversers and from 1942 Johnson Bar-fitted engines undergoing heavy overhaul or rebuilding had to be retro-fitted with power reverse. Exceptions existed for light, low-powered locomotives and
250:
connecting the two ends of the locking piston is also closed, thus holding the mechanism in position. The piston rod connects by levers to the reversing gear, which operates in the usual way, according to the type of valve gear in use.
82:, being connected to the various linkages and arms in order to serve its function in adjusting them. This means that the forces in the valve gear can be transmitted to the lever. This is especially the case if the engine has
63:, either above or below the pivot, in such a position as to give good leverage. A square pin is arranged to engage with the notches in the plates and hold the lever in the desired position when the trigger is released.
288:
used the
Ragonnet reversing gear, and other US builders generally abandoned positive locking features sooner than later. Many American locomotives were built, or retro-fitted, with power reversers, including the
98:
The dangers of the traditional
Johnson Bar (which grew as locomotive power, weight and operating steam pressures increased through the first half of the 20th century) led to it being banned in the USA by the
90:
trains each closure and opening of the regulator set up dynamic forces throughout the length of the train which risked broken couplings. The screw reverser overcame all these issues.
305:, but in Britain locking cylinders remained in use. The Hadfield reversing gear, patented in 1950, was in most particulars a Ragonnet reversing gear with added locking cylinder. Most
221:, his successor at that company, incorporated them into most of his designs, which were in production about thirty years after Stirling’s innovation. Later still the forward-looking
284:
was a major impetus to the development of power reverse systems, because these typically had two or even three sets of reverse gear, instead of just one on a simple locomotive. The
1033:
633:
66:
The advantages of this design are that change between forward and reverse gear can be made very quickly (as is needed in, for example, a shunting engine).
638:
540:
209:, but they found them little to their liking, mainly because of maintenance difficulties: any oil leakage from the locking cylinder, either through the
1026:
1908:
1019:
1483:
1478:
485:
366:
190:
1942:
1854:
981:
936:
821:
682:
533:
213:
or the cock, allowed the mechanism to creep, or worse “nose-dive”, into full forward gear while running. Stirling moved to the
1913:
1748:
1557:
100:
1201:
702:
246:
indicator showing the position of the rod and thus the percentage of cutoff in use. When the steam valve is at “stop”, an
672:
1587:
1577:
1781:
1645:
1626:
1617:
1501:
1113:
1056:
241:
Patented in 1882, the
Henszey's reversing gear illustrates a typical early solution. Henszey's device consists of two
1395:
526:
214:
206:
186:
1947:
1936:
1493:
926:
756:
1721:
1653:
285:
1983:
1957:
1952:
1873:
1597:
1542:
1264:
1220:
408:
194:
1962:
1860:
1701:
1582:
1233:
1171:
832:
796:
737:
281:
230:
218:
911:
1918:
1827:
1552:
1473:
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1071:
811:
732:
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662:
628:
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222:
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165:
127:
43:
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1123:
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1415:
1289:
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960:
727:
687:
446:
1814:
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1377:
886:
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610:
1678:
1526:
1516:
1465:
1420:
1400:
1387:
1367:
1349:
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1118:
1061:
766:
620:
481:
433:
362:
161:
1754:
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1715:
1441:
1359:
1329:
1181:
876:
722:
667:
558:
120:
1927:
1660:
1602:
1521:
1410:
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1319:
1274:
970:
871:
138:
1846:
1695:
1667:
1344:
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1066:
965:
955:
916:
856:
851:
816:
712:
692:
643:
264:
226:
144:
The two pistons of the steam reverser can be seen at the extreme left on this
Bulleid
1977:
1634:
1607:
1506:
1425:
1261:
945:
891:
866:
861:
786:
761:
202:
1835:
1592:
1339:
1324:
1279:
1133:
1128:
1042:
906:
791:
771:
210:
87:
42:
is used to control the direction of travel of the locomotive. It also adjusts the
1760:
1734:
1687:
1284:
1258:
1228:
1106:
1101:
921:
901:
881:
801:
575:
477:
247:
83:
1766:
1709:
1334:
1269:
1253:
1191:
1148:
1138:
841:
806:
776:
717:
653:
585:
563:
549:
459:
420:
79:
56:
17:
434:
Transactions of the
International Engineering Congress -- Railway Engineering
395:
382:
1562:
1547:
990:
600:
595:
580:
567:
30:
458:
James
Hadfield, Hydraulic Locking Cylinder for Locomotive Reversing Gear,
1451:
995:
590:
260:
104:
950:
846:
306:
302:
294:
290:
1567:
1304:
605:
298:
242:
518:
515: : Volume one; Seventh edition; London, Virtue and Company Ltd.
1086:
781:
747:
60:
29:
1011:
55:
notched sector plates. The reversing rod, which connects to the
1015:
522:
432:
George R. Henderson, Recent
Locomotive Development, Paper 90,
272:
controlled the reversing linkage and indicated its position.
506:
Locomotive
Practice and Performance in the Twentieth Century
394:
Eugine L. Ragonnet, Controlling
Mechanism for Locomotives,
259:
The Ragonnet power reverse, patented in 1909, was a true
233:
of locomotives, but they were mostly removed at rebuild.
185:
The first locomotive engineer to fit such a device was
193:
in 1873. Several engineers then tried them, including
474:
Illustrated Encyclopedia of World Railway Locomotives
381:
William P. Henszey, Reversing-Gear for Locomotives,
155:
In the screw reverser mechanism (sometimes called a
1901:
1872:
1845:
1826:
1780:
1733:
1686:
1677:
1644:
1625:
1616:
1535:
1492:
1464:
1434:
1386:
1358:
1312:
1303:
1219:
1147:
1094:
1085:
1049:
979:
935:
830:
746:
652:
619:
557:
361:. Avenel, New Jersey: Crescent Books. p. 105.
407:Jacob H Yoder, Locomotive Valves and Valve Gears,
78:The Johnson Bar is effectively part of the entire
462:, Sept. 26, 1950 (Oct. 7, 1944 in Great Britain).
445:Charles McShane, Locomotive Power Reverse Gears,
1027:
534:
436:, San Francisco, Sept. 20-25, 1915; page 491.
8:
357:Canestrari, Guido; Greggio, Luciano (1985).
27:Controller for the valves on a steam engine
1683:
1622:
1309:
1091:
1034:
1020:
1012:
541:
527:
519:
34:Steam reverser on a Southern Railway 2-8-0
419:Lincoln A. Lang, Servo Motor Mechanism,
410:, Van Nostrand, New York, 1917; page 131
1909:Glossary of steam locomotive components
330:
309:locomotives used the Hadfield system.
346:. Sutton, England: 638. January 1946.
7:
508:; W. Heffer and Sons Ltd.; Cambridge
449:, Griffin & Winters, 1921; 413.
1761:National Museum of Scotland engine
25:
191:Glasgow and South Western Railway
1943:List of steam technology patents
472:Ransome-Wallis, Patrick (2001).
137:
119:
822:Schwartzkopff-Eckhardt II bogie
59:, is attached to this (handle)
1928:Murdoch's model steam carriage
1914:History of steam road vehicles
130:controlled by a screw reverser
101:Interstate Commerce Commission
1:
1855:Murray's Hypocycloidal Engine
1578:Return connecting rod engine
1502:Condensing steam locomotive
255:The Ragonnet power reverser
38:On a steam locomotive, the
2000:
1809:"Coalbrookdale Locomotive"
338:"Railway Gazette :".
229:fitted them to his famous
1815:"Pen-y-Darren" locomotive
1484:Single- and double-acting
757:AAR type A switcher truck
511:Bell, A. Morton; (1950);
447:The Locomotive Up to Date
70:Limitations and drawbacks
46:of the steam locomotive.
1654:Newcomen Memorial Engine
504:Allen, Cecil J; (1949);
286:Baldwin Locomotive Works
237:Henszey's reversing gear
1958:Timeline of steam power
1953:Stationary steam engine
1836:Woolf's compound engine
1743:Soho Manufactory engine
1598:Steeple compound engine
1265:straight line mechanism
282:articulated locomotives
84:unbalanced slide valves
1963:Water-returning engine
1937:Lean's Engine Reporter
1710:Chacewater Mine engine
1583:Six-column beam engine
797:Krauss-Helmholtz bogie
219:Harry Smith Wainwright
162:Westinghouse air brake
35:
1803:London Steam Carriage
812:Radial steering truck
629:AAR wheel arrangement
476:. Mineola, New York:
460:U.S. Patent 2,523,696
421:U.S. Patent 1,480,940
319:Vehicular Johnson bar
276:Power reverse impetus
215:South Eastern Railway
207:North Eastern Railway
166:Stephenson valve gear
128:Stephenson valve gear
33:
1749:Bradley Works engine
1573:Reciprocating engine
1396:Babcock & Wilcox
1239:Centrifugal governor
639:Swiss classification
1290:Sun and planet gear
396:U.S. Patent 930,225
383:U.S. Patent 259,538
280:The development of
231:Merchant Navy Class
1790:Richard Trevithick
1388:Water-tube boilers
1202:Gresley conjugated
887:Klien-Lindner axle
634:UIC classification
611:Dual Control Stand
172:Power reverse gear
36:
1971:
1970:
1897:
1896:
1776:
1775:
1460:
1459:
1360:Fire-tube boilers
1215:
1214:
1009:
1008:
912:Road–rail vehicle
897:Luttermöller axle
767:Articulated bogie
621:Wheel arrangement
359:Steam Locomotives
16:(Redirected from
1991:
1921:fardier Ă vapeur
1755:Whitbread Engine
1716:Smethwick Engine
1684:
1623:
1442:Feedwater heater
1310:
1092:
1036:
1029:
1022:
1013:
782:Cleminson system
543:
536:
529:
520:
492:
491:
469:
463:
456:
450:
443:
437:
430:
424:
417:
411:
405:
399:
392:
386:
385:, June 13, 1882.
379:
373:
372:
354:
348:
347:
335:
223:Southern Railway
141:
123:
21:
1999:
1998:
1994:
1993:
1992:
1990:
1989:
1988:
1974:
1973:
1972:
1967:
1893:
1868:
1841:
1822:
1772:
1729:
1673:
1661:Fairbottom Bobs
1646:Newcomen engine
1640:
1612:
1558:Expansion valve
1531:
1517:Watt's separate
1488:
1456:
1430:
1382:
1354:
1299:
1275:Parallel motion
1211:
1162:Stephenson link
1143:
1081:
1050:Operating cycle
1045:
1040:
1010:
1005:
975:
931:
872:Equalising beam
826:
742:
648:
615:
562:
553:
547:
501:
496:
495:
488:
480:. p. 278.
471:
470:
466:
457:
453:
444:
440:
431:
427:
423:, Jan 15, 1924.
418:
414:
406:
402:
398:, Aug. 9, 1909.
393:
389:
380:
376:
369:
356:
355:
351:
340:Railway Gazette
337:
336:
332:
327:
315:
278:
174:
153:
152:
151:
150:
149:
142:
133:
132:
131:
124:
113:
96:
72:
52:
50:Reversing lever
28:
23:
22:
15:
12:
11:
5:
1997:
1995:
1987:
1986:
1984:Piston engines
1976:
1975:
1969:
1968:
1966:
1965:
1960:
1955:
1950:
1945:
1940:
1933:
1932:
1931:
1925:
1911:
1905:
1903:
1899:
1898:
1895:
1894:
1892:
1891:
1885:
1878:
1876:
1870:
1869:
1867:
1866:
1858:
1851:
1849:
1843:
1842:
1840:
1839:
1832:
1830:
1824:
1823:
1821:
1820:
1819:
1818:
1812:
1806:
1800:
1786:
1784:
1778:
1777:
1774:
1773:
1771:
1770:
1764:
1758:
1752:
1746:
1739:
1737:
1731:
1730:
1728:
1727:
1719:
1713:
1707:
1699:
1696:Kinneil Engine
1692:
1690:
1681:
1675:
1674:
1672:
1671:
1668:Elsecar Engine
1665:
1657:
1650:
1648:
1642:
1641:
1639:
1638:
1631:
1629:
1620:
1614:
1613:
1611:
1610:
1605:
1600:
1595:
1590:
1588:Steeple engine
1585:
1580:
1575:
1570:
1565:
1560:
1555:
1550:
1545:
1539:
1537:
1533:
1532:
1530:
1529:
1524:
1519:
1514:
1509:
1504:
1498:
1496:
1490:
1489:
1487:
1486:
1481:
1476:
1470:
1468:
1462:
1461:
1458:
1457:
1455:
1454:
1449:
1447:Feedwater pump
1444:
1438:
1436:
1432:
1431:
1429:
1428:
1423:
1418:
1413:
1408:
1403:
1398:
1392:
1390:
1384:
1383:
1381:
1380:
1375:
1370:
1364:
1362:
1356:
1355:
1353:
1352:
1347:
1342:
1337:
1332:
1327:
1322:
1316:
1314:
1313:Simple boilers
1307:
1301:
1300:
1298:
1297:
1295:Watt's linkage
1292:
1287:
1282:
1277:
1272:
1267:
1256:
1251:
1246:
1244:Connecting rod
1241:
1236:
1231:
1225:
1223:
1217:
1216:
1213:
1212:
1210:
1209:
1204:
1199:
1194:
1189:
1184:
1179:
1174:
1169:
1164:
1159:
1153:
1151:
1145:
1144:
1142:
1141:
1136:
1131:
1126:
1121:
1116:
1111:
1110:
1109:
1098:
1096:
1089:
1083:
1082:
1080:
1079:
1074:
1069:
1064:
1059:
1053:
1051:
1047:
1046:
1041:
1039:
1038:
1031:
1024:
1016:
1007:
1006:
1004:
1003:
998:
993:
987:
985:
982:exhaust system
977:
976:
974:
973:
968:
963:
958:
953:
948:
942:
940:
937:Exhaust system
933:
932:
930:
929:
924:
919:
917:Trailing wheel
914:
909:
904:
899:
894:
889:
884:
879:
874:
869:
864:
859:
857:Carrying wheel
854:
852:Beugniot lever
849:
844:
838:
836:
828:
827:
825:
824:
819:
817:Scheffel bogie
814:
809:
804:
799:
794:
789:
784:
779:
774:
769:
764:
759:
753:
751:
744:
743:
741:
740:
735:
730:
725:
720:
715:
710:
705:
700:
695:
690:
685:
680:
675:
670:
665:
659:
657:
650:
649:
647:
646:
644:Whyte notation
641:
636:
631:
625:
623:
617:
616:
614:
613:
608:
603:
598:
593:
588:
583:
578:
572:
570:
555:
554:
548:
546:
545:
538:
531:
523:
517:
516:
509:
500:
497:
494:
493:
486:
464:
451:
438:
425:
412:
400:
387:
374:
367:
349:
329:
328:
326:
323:
322:
321:
314:
311:
277:
274:
265:servomechanism
257:
256:
239:
238:
227:Oliver Bulleid
187:James Stirling
183:
182:
173:
170:
164:equipment and
143:
136:
135:
134:
125:
118:
117:
116:
115:
114:
112:
111:Screw reverser
109:
95:
92:
71:
68:
51:
48:
40:reversing gear
26:
24:
18:Steam reverser
14:
13:
10:
9:
6:
4:
3:
2:
1996:
1985:
1982:
1981:
1979:
1964:
1961:
1959:
1956:
1954:
1951:
1949:
1946:
1944:
1941:
1939:
1938:
1934:
1929:
1926:
1923:
1922:
1917:
1916:
1915:
1912:
1910:
1907:
1906:
1904:
1900:
1889:
1886:
1883:
1880:
1879:
1877:
1875:
1871:
1864:
1863:
1859:
1856:
1853:
1852:
1850:
1848:
1844:
1837:
1834:
1833:
1831:
1829:
1825:
1816:
1813:
1810:
1807:
1804:
1801:
1798:
1797:
1796:Puffing Devil
1793:
1792:
1791:
1788:
1787:
1785:
1783:
1782:High-pressure
1779:
1768:
1765:
1762:
1759:
1756:
1753:
1750:
1747:
1744:
1741:
1740:
1738:
1736:
1735:Rotative beam
1732:
1725:
1724:
1720:
1717:
1714:
1711:
1708:
1705:
1704:
1700:
1697:
1694:
1693:
1691:
1689:
1685:
1682:
1680:
1676:
1669:
1666:
1663:
1662:
1658:
1655:
1652:
1651:
1649:
1647:
1643:
1636:
1635:Savery Engine
1633:
1632:
1630:
1628:
1624:
1621:
1619:
1615:
1609:
1608:Working fluid
1606:
1604:
1601:
1599:
1596:
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1472:
1471:
1469:
1467:
1463:
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1433:
1427:
1424:
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1399:
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1318:
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1311:
1308:
1306:
1302:
1296:
1293:
1291:
1288:
1286:
1285:Rotative beam
1283:
1281:
1278:
1276:
1273:
1271:
1268:
1266:
1263:
1262:hypocycloidal
1260:
1257:
1255:
1252:
1250:
1247:
1245:
1242:
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1237:
1235:
1232:
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1208:
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1200:
1198:
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1120:
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1073:
1070:
1068:
1065:
1063:
1060:
1058:
1055:
1054:
1052:
1048:
1044:
1043:Steam engines
1037:
1032:
1030:
1025:
1023:
1018:
1017:
1014:
1002:
999:
997:
994:
992:
989:
988:
986:
983:
978:
972:
969:
967:
964:
962:
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938:
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928:
925:
923:
920:
918:
915:
913:
910:
908:
905:
903:
900:
898:
895:
893:
892:Leading wheel
890:
888:
885:
883:
880:
878:
877:Gölsdorf axle
875:
873:
870:
868:
867:Driving wheel
865:
863:
862:Coupled wheel
860:
858:
855:
853:
850:
848:
845:
843:
840:
839:
837:
834:
829:
823:
820:
818:
815:
813:
810:
808:
805:
803:
800:
798:
795:
793:
790:
788:
787:Grovers bogie
785:
783:
780:
778:
775:
773:
770:
768:
765:
763:
762:Arnoux system
760:
758:
755:
754:
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749:
745:
739:
736:
734:
731:
729:
726:
724:
721:
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709:
706:
704:
701:
699:
696:
694:
691:
689:
686:
684:
681:
679:
676:
674:
673:Bagnall–Price
671:
669:
666:
664:
661:
660:
658:
655:
651:
645:
642:
640:
637:
635:
632:
630:
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584:
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579:
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569:
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560:
556:
551:
544:
539:
537:
532:
530:
525:
524:
521:
514:
510:
507:
503:
502:
498:
489:
487:0-486-41247-4
483:
479:
475:
468:
465:
461:
455:
452:
448:
442:
439:
435:
429:
426:
422:
416:
413:
409:
404:
401:
397:
391:
388:
384:
378:
375:
370:
368:0-517-48366-1
364:
360:
353:
350:
345:
341:
334:
331:
324:
320:
317:
316:
312:
310:
308:
307:Beyer Garratt
304:
300:
296:
292:
287:
283:
275:
273:
270:
266:
262:
254:
253:
252:
249:
244:
236:
235:
234:
232:
228:
224:
220:
216:
212:
208:
204:
203:Vincent Raven
200:
196:
192:
188:
181:Stirling gear
180:
179:
178:
171:
169:
167:
163:
158:
147:
146:Merchant Navy
140:
129:
122:
110:
108:
106:
102:
94:Ban in the US
93:
91:
89:
88:loose coupled
85:
81:
76:
69:
67:
64:
62:
58:
49:
47:
45:
41:
32:
19:
1948:Modern steam
1935:
1920:
1882:Porter-Allen
1861:
1795:
1722:
1702:
1659:
1593:Safety valve
1522:"Pickle-pot"
1416:Thimble tube
907:Railway tire
833:running gear
792:Jacobs bogie
772:Bissel truck
561:positioning
512:
505:
473:
467:
454:
441:
428:
415:
403:
390:
377:
358:
352:
343:
339:
333:
279:
268:
258:
240:
211:piston gland
195:William Dean
184:
175:
157:bacon slicer
156:
154:
145:
97:
77:
73:
65:
53:
39:
37:
1679:Watt engine
1479:Oscillating
1435:Boiler feed
1280:Plate chain
1259:Tusi couple
1172:Walschaerts
1057:Atmospheric
922:Train wheel
902:Radial axle
882:Journal box
802:Mason Bogie
738:Walschaerts
576:Cab forward
513:Locomotives
478:Dover Books
263:controlled
126:Diagram of
1888:Ljungström
1874:High-speed
1767:Lap Engine
1723:Resolution
1627:Precursors
1512:Kirchweger
1474:Locomotive
1421:Three-drum
1401:Field-tube
1368:Locomotive
1350:Lancashire
1270:Link chain
1254:Crankshaft
1221:Mechanisms
1149:Valve gear
842:Adams axle
807:Pony truck
777:Blomberg B
733:Stephenson
718:Kuhn slide
654:Valve gear
586:Steeplecab
564:Short hood
550:Locomotive
325:References
269:servomotor
80:valve gear
57:valve gear
1919:Cugnot's
1862:Salamanca
1563:Hydrolock
1548:Crosshead
1494:Condenser
1330:Egg-ended
991:Blastpipe
708:Hackworth
601:Cowl unit
596:Hood unit
581:Sharknose
568:Long hood
225:engineer
105:switchers
1978:Category
1902:See also
1828:Compound
1703:Old Bess
1543:Blowback
1466:Cylinder
1452:Injector
1411:Stirling
1406:Sentinel
1320:Haystack
1234:Cataract
1207:Southern
1197:Caprotti
1072:Compound
996:Smokebox
984:elements
961:Lemaître
927:Wheelset
835:elements
728:Southern
688:Caprotti
591:Cab unit
313:See also
261:feedback
248:oil cock
1618:History
1527:Surface
1345:Cornish
1305:Boilers
1187:Corliss
1124:Corliss
1107:D slide
1077:Uniflow
1067:Cornish
1001:Chimney
980:Common
971:Lemprex
951:Kylchap
847:Axlebox
703:Gresley
683:Bulleid
678:Baguley
499:Sources
303:PRR L1s
295:PRR N1s
291:PRR K4s
243:pistons
205:of the
197:of the
189:of the
1930:(1784)
1924:(1769)
1890:(1908)
1884:(1862)
1865:(1812)
1857:(1805)
1847:Murray
1838:(1803)
1817:(1804)
1811:(1803)
1805:(1803)
1799:(1801)
1769:(1788)
1763:(1786)
1757:(1785)
1751:(1783)
1745:(1782)
1726:(1781)
1718:(1779)
1712:(1778)
1706:(1777)
1698:(1768)
1670:(1795)
1664:(1760)
1656:(1725)
1637:(1698)
1603:Stroke
1568:Piston
1553:Cutoff
1426:Yarrow
1378:Launch
1373:Scotch
1134:Sleeve
1129:Poppet
1114:Piston
1095:Valves
1087:Valves
966:Lempor
956:Kylpor
831:Other
606:Boxcab
552:design
484:
365:
301:, and
299:PRR B6
44:cutoff
1536:Other
1340:Flued
1325:Wagon
1249:Crank
1192:Lentz
1182:Baker
1177:Allan
1102:Slide
946:Giesl
939:types
750:types
748:Bogie
723:Lentz
698:Gooch
668:Baker
663:Allan
656:types
148:class
61:lever
1688:Beam
1229:Beam
1139:Bash
1119:Drop
1062:Watt
482:ISBN
363:ISBN
217:and
201:and
1507:Jet
1335:Box
1167:Joy
1157:Gab
713:Joy
693:Gab
559:Cab
199:GWR
1980::
566:/
344:86
342:.
297:,
293:,
1035:e
1028:t
1021:v
542:e
535:t
528:v
490:.
371:.
20:)
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