32:
20:
133:
Walschaerts valve gear, but it was later found that some of the losses of the
Walschaerts locomotives was due to leakage of steam past the valve heads, where a single wide ring was used. New piston valves having several narrow rings were fitted to one locomotive, and it was then found that the Walschaerts valve gear could be just as economical as the Caprotti, but with considerably less cost of fitment. No more
100:
mixed-traffic locomotive in 1921; although more expensive and complicated than the standard piston valves, it substantially improved the locomotive's performance. Until the 1930s it was fitted on some 334 FS locomotives and on 77 narrow-gauge locomotives of other companies; of the former, some were
132:
and piston valves with which this class was originally fitted, to enable comparisons to be made between the two types of valve gear. Later that year, no. 5908 was also given a larger boiler. It was found that the
Caprotti-fitted locomotives were more economical on coal and water than those with
194:
Although more expensive to manufacture than its rivals, the improved
Caprotti valve gear is considerably more efficient than any other. A major improvement is that much of the mechanism is enclosed, leading to reduced wear and tear from the harsh steam locomotive environment, and completely
148:
were rebuilt with
Caprotti valve gear in 1929, followed by a further two in 1938–39. These locomotives also had four cylinders, and the poppet valves were mounted vertically, two at each end of each cylinder. One of the first pair of locomotives was rebuilt with
127:
with
Caprotti valve gear and poppet valves. Following trials, nine more were rebuilt in 1928 with Caprotti valve gear, poppet valves and larger boilers, and also in 1928 ten others of the same class were given the larger boiler but retained the
70:
used in other valve gear. While basing his design on automotive valves, Caprotti made several significant departures from this design to adapt the valves for steam. Having agreed a joint-venture with
817:
417:
296:
1532:
104:
Given their need for more complex and expensive maintenance, most of these locomotives were generally withdrawn from service before those with
422:
324:
191:
being particularly disappointing. That was later found to be due to errors elsewhere in the design and construction of the locomotive.
810:
257:
1692:
1565:
1702:
291:
960:
446:
1598:
1371:
803:
117:
1267:
1262:
265:
228:
173:
1410:
1726:
1638:
141:
765:
720:
605:
466:
317:
1592:
1767:
1697:
1341:
481:
1586:
985:
486:
91:
1573:
1361:
456:
1711:
1777:
1429:
1401:
1285:
897:
840:
67:
1300:
1179:
310:
1731:
1720:
1578:
1277:
890:
710:
540:
170:
1505:
1437:
1741:
1736:
1657:
1526:
1381:
1326:
1048:
1004:
1544:
1305:
1772:
1746:
1644:
1518:
1485:
1366:
1068:
1017:
955:
616:
580:
521:
150:
129:
105:
31:
1611:
1336:
1257:
1230:
1027:
945:
855:
695:
595:
516:
412:
1671:
1356:
1295:
1156:
1022:
970:
907:
860:
784:
491:
121:
680:
8:
1665:
1199:
1073:
990:
511:
181:
177:
137:
were fitted with
Caprotti valve gear, and the ten locomotives were withdrawn in 1935–36.
23:
744:
19:
1161:
670:
461:
394:
153:
in 1943, but the other three ran with
Caprotti valve gear until withdrawal in 1946–47.
75:
71:
1462:
1310:
1249:
1204:
1184:
1171:
1151:
1133:
1078:
1032:
902:
845:
550:
404:
271:
261:
224:
1538:
1499:
1225:
1143:
1113:
965:
506:
451:
342:
166:
660:
1444:
1386:
1194:
1189:
1103:
1058:
754:
655:
55:
1630:
1479:
1451:
1128:
950:
940:
850:
749:
739:
700:
640:
635:
600:
496:
476:
427:
565:
101:
new-builds, the others were rebuilds of non-superheated compound locomotives.
1761:
1418:
1391:
1290:
1209:
1045:
729:
675:
650:
645:
570:
545:
275:
249:
145:
1619:
1376:
1123:
1108:
1063:
917:
912:
826:
690:
575:
555:
94:
79:
63:
44:
1471:
1042:
1012:
885:
705:
685:
665:
585:
359:
254:
Locomotives of the L.N.E.R., part 2B: Tender
Engines - Classes B1 to B19
1550:
1493:
1118:
1053:
1037:
975:
932:
922:
625:
590:
560:
501:
437:
369:
347:
333:
221:
Historical
Locomotive Monographs No. 3 - Claughton & Patriot 4-6-0s
216:
47:
1346:
1331:
774:
384:
379:
364:
351:
245:
302:
1235:
779:
374:
59:
734:
630:
795:
1351:
1088:
389:
870:
531:
97:
51:
78:
from 1938, Heenan & Froude fully acquired
Caprotti post-
195:
independent control of admission and exhaust. The restored
161:
In the 1950s, Caprotti valve gear was improved and this
120:
equipped four-cylinder 4-6-0 locomotive no. 5908 of the
223:. Didcot: Wild Swan. pp. 33, 35, 37, 44, 57, 97.
292:
British Caprotti Valve Gear on the Duke of Gloucester
243:
199:, with its flaws eliminated, has proved the concept.
248:; Manners, F.; Neve, E.; Platt, E.N.T.; Proud, P.;
244:Boddy, M.G.; Brown, W.A.; Fry, E.V.; Hennigan, W.;
187:. Results were mixed, with the performance of the
1759:
299:with Caprotti gear, Midland Railway - Butterley.
214:
90:The Caprotti valve gear was first tested on a
811:
318:
818:
804:
325:
311:
111:
30:
18:
1693:Glossary of steam locomotive components
1760:
799:
332:
306:
118:London, Midland and Scottish Railway
180:, numbers 73125-54, and the unique
156:
35:Caprotti valve gear on BR no. 73129
13:
1545:National Museum of Scotland engine
14:
1789:
825:
285:
144:(LNER), two 4-6-0 locomotives of
85:
1727:List of steam technology patents
142:London and North Eastern Railway
606:Schwartzkopff-Eckhardt II bogie
50:invented in the early 1920s by
16:Type of steam engine valve gear
1712:Murdoch's model steam carriage
1698:History of steam road vehicles
237:
208:
1:
1639:Murray's Hypocycloidal Engine
297:BR Standard Class 5, No 73129
202:
92:Ferrovie dello Stato Italiane
1362:Return connecting rod engine
7:
1286:Condensing steam locomotive
165:was fitted to the last two
163:British Caprotti valve gear
74:-based engineering company
10:
1794:
1593:"Coalbrookdale Locomotive"
182:BR standard class 8 71000
1685:
1656:
1629:
1610:
1599:"Pen-y-Darren" locomotive
1564:
1517:
1470:
1461:
1428:
1409:
1400:
1319:
1276:
1268:Single- and double-acting
1248:
1218:
1170:
1142:
1096:
1087:
1003:
931:
878:
869:
833:
763:
719:
614:
541:AAR type A switcher truck
530:
436:
403:
341:
1438:Newcomen Memorial Engine
54:architect and engineer
1742:Timeline of steam power
1737:Stationary steam engine
1620:Woolf's compound engine
1527:Soho Manufactory engine
1382:Steeple compound engine
1049:straight line mechanism
1747:Water-returning engine
1721:Lean's Engine Reporter
1494:Chacewater Mine engine
1367:Six-column beam engine
581:Krauss-Helmholtz bogie
260:. pp. 17–18, 23.
151:Walschaerts valve gear
130:Walschaerts valve gear
112:Usage in Great Britain
106:Walschaerts valve gear
36:
28:
1768:Locomotive valve gear
1587:London Steam Carriage
596:Radial steering truck
413:AAR wheel arrangement
34:
22:
1533:Bradley Works engine
1357:Reciprocating engine
1180:Babcock & Wilcox
1023:Centrifugal governor
423:Swiss classification
219:; James, F. (2006).
178:BR standard class 5s
116:In August 1926, the
1074:Sun and planet gear
76:Heenan & Froude
41:Caprotti valve gear
1778:Italian inventions
1574:Richard Trevithick
1172:Water-tube boilers
986:Gresley conjugated
671:Klien-Lindner axle
418:UIC classification
395:Dual Control Stand
197:Duke of Gloucester
189:Duke of Gloucester
184:Duke of Gloucester
37:
29:
25:Duke of Gloucester
1755:
1754:
1681:
1680:
1560:
1559:
1244:
1243:
1144:Fire-tube boilers
999:
998:
793:
792:
696:Road–rail vehicle
681:Luttermöller axle
551:Articulated bogie
405:Wheel arrangement
1785:
1705:fardier Ă vapeur
1539:Whitbread Engine
1500:Smethwick Engine
1468:
1467:
1407:
1406:
1226:Feedwater heater
1094:
1093:
876:
875:
820:
813:
806:
797:
796:
566:Cleminson system
327:
320:
313:
304:
303:
280:
279:
241:
235:
234:
212:
167:British Railways
157:British Caprotti
108:, in the 1960s.
66:rather than the
1793:
1792:
1788:
1787:
1786:
1784:
1783:
1782:
1758:
1757:
1756:
1751:
1677:
1652:
1625:
1606:
1556:
1513:
1457:
1445:Fairbottom Bobs
1430:Newcomen engine
1424:
1396:
1342:Expansion valve
1315:
1301:Watt's separate
1272:
1240:
1214:
1166:
1138:
1083:
1059:Parallel motion
995:
946:Stephenson link
927:
865:
834:Operating cycle
829:
824:
794:
789:
759:
715:
656:Equalising beam
610:
526:
432:
399:
346:
337:
331:
288:
283:
268:
242:
238:
231:
213:
209:
205:
159:
114:
88:
56:Arturo Caprotti
17:
12:
11:
5:
1791:
1781:
1780:
1775:
1770:
1753:
1752:
1750:
1749:
1744:
1739:
1734:
1729:
1724:
1717:
1716:
1715:
1709:
1695:
1689:
1687:
1683:
1682:
1679:
1678:
1676:
1675:
1669:
1662:
1660:
1654:
1653:
1651:
1650:
1642:
1635:
1633:
1627:
1626:
1624:
1623:
1616:
1614:
1608:
1607:
1605:
1604:
1603:
1602:
1596:
1590:
1584:
1570:
1568:
1562:
1561:
1558:
1557:
1555:
1554:
1548:
1542:
1536:
1530:
1523:
1521:
1515:
1514:
1512:
1511:
1503:
1497:
1491:
1483:
1480:Kinneil Engine
1476:
1474:
1465:
1459:
1458:
1456:
1455:
1452:Elsecar Engine
1449:
1441:
1434:
1432:
1426:
1425:
1423:
1422:
1415:
1413:
1404:
1398:
1397:
1395:
1394:
1389:
1384:
1379:
1374:
1372:Steeple engine
1369:
1364:
1359:
1354:
1349:
1344:
1339:
1334:
1329:
1323:
1321:
1317:
1316:
1314:
1313:
1308:
1303:
1298:
1293:
1288:
1282:
1280:
1274:
1273:
1271:
1270:
1265:
1260:
1254:
1252:
1246:
1245:
1242:
1241:
1239:
1238:
1233:
1231:Feedwater pump
1228:
1222:
1220:
1216:
1215:
1213:
1212:
1207:
1202:
1197:
1192:
1187:
1182:
1176:
1174:
1168:
1167:
1165:
1164:
1159:
1154:
1148:
1146:
1140:
1139:
1137:
1136:
1131:
1126:
1121:
1116:
1111:
1106:
1100:
1098:
1097:Simple boilers
1091:
1085:
1084:
1082:
1081:
1079:Watt's linkage
1076:
1071:
1066:
1061:
1056:
1051:
1040:
1035:
1030:
1028:Connecting rod
1025:
1020:
1015:
1009:
1007:
1001:
1000:
997:
996:
994:
993:
988:
983:
978:
973:
968:
963:
958:
953:
948:
943:
937:
935:
929:
928:
926:
925:
920:
915:
910:
905:
900:
895:
894:
893:
882:
880:
873:
867:
866:
864:
863:
858:
853:
848:
843:
837:
835:
831:
830:
823:
822:
815:
808:
800:
791:
790:
788:
787:
782:
777:
771:
769:
766:exhaust system
761:
760:
758:
757:
752:
747:
742:
737:
732:
726:
724:
721:Exhaust system
717:
716:
714:
713:
708:
703:
701:Trailing wheel
698:
693:
688:
683:
678:
673:
668:
663:
658:
653:
648:
643:
641:Carrying wheel
638:
636:Beugniot lever
633:
628:
622:
620:
612:
611:
609:
608:
603:
601:Scheffel bogie
598:
593:
588:
583:
578:
573:
568:
563:
558:
553:
548:
543:
537:
535:
528:
527:
525:
524:
519:
514:
509:
504:
499:
494:
489:
484:
479:
474:
469:
464:
459:
454:
449:
443:
441:
434:
433:
431:
430:
428:Whyte notation
425:
420:
415:
409:
407:
401:
400:
398:
397:
392:
387:
382:
377:
372:
367:
362:
356:
354:
339:
338:
330:
329:
322:
315:
307:
301:
300:
294:
287:
286:External links
284:
282:
281:
266:
252:(March 1975).
236:
229:
215:Toms, George;
206:
204:
201:
176:, the last 30
158:
155:
113:
110:
87:
86:Usage in Italy
84:
15:
9:
6:
4:
3:
2:
1790:
1779:
1776:
1774:
1773:Engine valves
1771:
1769:
1766:
1765:
1763:
1748:
1745:
1743:
1740:
1738:
1735:
1733:
1730:
1728:
1725:
1723:
1722:
1718:
1713:
1710:
1707:
1706:
1701:
1700:
1699:
1696:
1694:
1691:
1690:
1688:
1684:
1673:
1670:
1667:
1664:
1663:
1661:
1659:
1655:
1648:
1647:
1643:
1640:
1637:
1636:
1634:
1632:
1628:
1621:
1618:
1617:
1615:
1613:
1609:
1600:
1597:
1594:
1591:
1588:
1585:
1582:
1581:
1580:Puffing Devil
1577:
1576:
1575:
1572:
1571:
1569:
1567:
1566:High-pressure
1563:
1552:
1549:
1546:
1543:
1540:
1537:
1534:
1531:
1528:
1525:
1524:
1522:
1520:
1519:Rotative beam
1516:
1509:
1508:
1504:
1501:
1498:
1495:
1492:
1489:
1488:
1484:
1481:
1478:
1477:
1475:
1473:
1469:
1466:
1464:
1460:
1453:
1450:
1447:
1446:
1442:
1439:
1436:
1435:
1433:
1431:
1427:
1420:
1419:Savery Engine
1417:
1416:
1414:
1412:
1408:
1405:
1403:
1399:
1393:
1392:Working fluid
1390:
1388:
1385:
1383:
1380:
1378:
1375:
1373:
1370:
1368:
1365:
1363:
1360:
1358:
1355:
1353:
1350:
1348:
1345:
1343:
1340:
1338:
1335:
1333:
1330:
1328:
1325:
1324:
1322:
1318:
1312:
1309:
1307:
1304:
1302:
1299:
1297:
1294:
1292:
1289:
1287:
1284:
1283:
1281:
1279:
1275:
1269:
1266:
1264:
1261:
1259:
1256:
1255:
1253:
1251:
1247:
1237:
1234:
1232:
1229:
1227:
1224:
1223:
1221:
1217:
1211:
1208:
1206:
1203:
1201:
1198:
1196:
1193:
1191:
1188:
1186:
1183:
1181:
1178:
1177:
1175:
1173:
1169:
1163:
1160:
1158:
1155:
1153:
1150:
1149:
1147:
1145:
1141:
1135:
1132:
1130:
1127:
1125:
1122:
1120:
1117:
1115:
1112:
1110:
1107:
1105:
1102:
1101:
1099:
1095:
1092:
1090:
1086:
1080:
1077:
1075:
1072:
1070:
1069:Rotative beam
1067:
1065:
1062:
1060:
1057:
1055:
1052:
1050:
1047:
1046:hypocycloidal
1044:
1041:
1039:
1036:
1034:
1031:
1029:
1026:
1024:
1021:
1019:
1016:
1014:
1011:
1010:
1008:
1006:
1002:
992:
989:
987:
984:
982:
979:
977:
974:
972:
969:
967:
964:
962:
959:
957:
954:
952:
949:
947:
944:
942:
939:
938:
936:
934:
930:
924:
921:
919:
916:
914:
911:
909:
906:
904:
901:
899:
896:
892:
889:
888:
887:
884:
883:
881:
877:
874:
872:
868:
862:
859:
857:
854:
852:
849:
847:
844:
842:
839:
838:
836:
832:
828:
827:Steam engines
821:
816:
814:
809:
807:
802:
801:
798:
786:
783:
781:
778:
776:
773:
772:
770:
767:
762:
756:
753:
751:
748:
746:
743:
741:
738:
736:
733:
731:
728:
727:
725:
722:
718:
712:
709:
707:
704:
702:
699:
697:
694:
692:
689:
687:
684:
682:
679:
677:
676:Leading wheel
674:
672:
669:
667:
664:
662:
661:Gölsdorf axle
659:
657:
654:
652:
651:Driving wheel
649:
647:
646:Coupled wheel
644:
642:
639:
637:
634:
632:
629:
627:
624:
623:
621:
618:
613:
607:
604:
602:
599:
597:
594:
592:
589:
587:
584:
582:
579:
577:
574:
572:
571:Grovers bogie
569:
567:
564:
562:
559:
557:
554:
552:
549:
547:
546:Arnoux system
544:
542:
539:
538:
536:
533:
529:
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:
458:
457:Bagnall–Price
455:
453:
450:
448:
445:
444:
442:
439:
435:
429:
426:
424:
421:
419:
416:
414:
411:
410:
408:
406:
402:
396:
393:
391:
388:
386:
383:
381:
378:
376:
373:
371:
368:
366:
363:
361:
358:
357:
355:
353:
349:
344:
340:
335:
328:
323:
321:
316:
314:
309:
308:
305:
298:
295:
293:
290:
289:
277:
273:
269:
267:0-901115-73-8
263:
259:
255:
251:
247:
240:
232:
230:1-905184-19-0
226:
222:
218:
211:
207:
200:
198:
192:
190:
186:
185:
179:
175:
172:
171:'Black Fives'
168:
164:
154:
152:
147:
146:LNER Class B3
143:
138:
136:
131:
126:
124:
119:
109:
107:
102:
99:
96:
93:
83:
81:
77:
73:
69:
68:piston valves
65:
64:poppet valves
61:
57:
53:
49:
46:
43:is a type of
42:
33:
27:
26:
21:
1732:Modern steam
1719:
1704:
1666:Porter-Allen
1645:
1579:
1506:
1486:
1443:
1377:Safety valve
1306:"Pickle-pot"
1200:Thimble tube
980:
691:Railway tire
617:running gear
576:Jacobs bogie
556:Bissel truck
471:
345:positioning
253:
250:Yeadon, W.B.
239:
220:
217:Essery, R.J.
210:
196:
193:
188:
183:
162:
160:
139:
134:
122:
115:
103:
89:
80:World War II
45:steam engine
40:
38:
24:
1463:Watt engine
1263:Oscillating
1219:Boiler feed
1064:Plate chain
1043:Tusi couple
956:Walschaerts
841:Atmospheric
706:Train wheel
686:Radial axle
666:Journal box
586:Mason Bogie
522:Walschaerts
360:Cab forward
256:. Lincoln:
1762:Categories
1672:Ljungström
1658:High-speed
1551:Lap Engine
1507:Resolution
1411:Precursors
1296:Kirchweger
1258:Locomotive
1205:Three-drum
1185:Field-tube
1152:Locomotive
1134:Lancashire
1054:Link chain
1038:Crankshaft
1005:Mechanisms
933:Valve gear
626:Adams axle
591:Pony truck
561:Blomberg B
517:Stephenson
502:Kuhn slide
438:Valve gear
370:Steeplecab
348:Short hood
334:Locomotive
246:Hoole, Ken
203:References
135:Claughtons
58:. It uses
48:valve gear
1703:Cugnot's
1646:Salamanca
1347:Hydrolock
1332:Crosshead
1278:Condenser
1114:Egg-ended
775:Blastpipe
492:Hackworth
385:Cowl unit
380:Hood unit
365:Sharknose
352:Long hood
276:655688865
123:Claughton
95:Class 740
82:in 1947.
72:Worcester
60:camshafts
1686:See also
1612:Compound
1487:Old Bess
1327:Blowback
1250:Cylinder
1236:Injector
1195:Stirling
1190:Sentinel
1104:Haystack
1018:Cataract
991:Southern
981:Caprotti
856:Compound
780:Smokebox
768:elements
745:Lemaître
711:Wheelset
619:elements
512:Southern
472:Caprotti
375:Cab unit
1402:History
1311:Surface
1129:Cornish
1089:Boilers
971:Corliss
908:Corliss
891:D slide
861:Uniflow
851:Cornish
785:Chimney
764:Common
755:Lemprex
735:Kylchap
631:Axlebox
487:Gresley
467:Bulleid
462:Baguley
174:44686/7
169:-built
140:On the
52:Italian
1714:(1784)
1708:(1769)
1674:(1908)
1668:(1862)
1649:(1812)
1641:(1805)
1631:Murray
1622:(1803)
1601:(1804)
1595:(1803)
1589:(1803)
1583:(1801)
1553:(1788)
1547:(1786)
1541:(1785)
1535:(1783)
1529:(1782)
1510:(1781)
1502:(1779)
1496:(1778)
1490:(1777)
1482:(1768)
1454:(1795)
1448:(1760)
1440:(1725)
1421:(1698)
1387:Stroke
1352:Piston
1337:Cutoff
1210:Yarrow
1162:Launch
1157:Scotch
918:Sleeve
913:Poppet
898:Piston
879:Valves
871:Valves
750:Lempor
740:Kylpor
615:Other
390:Boxcab
336:design
274:
264:
227:
1320:Other
1124:Flued
1109:Wagon
1033:Crank
976:Lentz
966:Baker
961:Allan
886:Slide
730:Giesl
723:types
534:types
532:Bogie
507:Lentz
482:Gooch
452:Baker
447:Allan
440:types
125:Class
98:2-8-0
1472:Beam
1013:Beam
923:Bash
903:Drop
846:Watt
272:OCLC
262:ISBN
258:RCTS
225:ISBN
62:and
39:The
1291:Jet
1119:Box
951:Joy
941:Gab
497:Joy
477:Gab
343:Cab
1764::
350:/
270:.
819:e
812:t
805:v
326:e
319:t
312:v
278:.
233:.
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