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minus the throw of eventual inside cranks; at the same time there was a reluctance to make the coupling rods too long due to concerns about material resistance, for a broken coupling rod could impact the locomotive or anything by the track. One way to resolve this was to eliminate the coupling rods and to have two independent pairs of driving wheels each pair driven by its own cylinders.
532:
In the case of
Drummond, the main motive appears to have been to obtain maximum grate area in a period where low-pitched boilers were the norm and the firebox had to be set low between the frames. This limited the width of the grate whilst its length depended on the distance between the coupled axles
545:
in France who initially combined divided drive and independent driving axles, finally opting solely for the former whilst coupling the driving wheels. The aforementioned engineers' locomotives were compounds, and the layout was also a way of separating high-pressure from low-pressure drive trains.
519:
Throughout locomotive history, this type of layout with independent uncoupled trains of driving wheels mounted on a common rigid chassis has been repeatedly tried with various aims in mind (the best-known more recent example is the
563:
so that the principal benefit sought would be the increased grate area. Compared with
Drummond's standard boilers, the T7's barrel length was increased by 1 ft 6 in (0.46 m) to 12 ft (3.7 m).
511:(LNWR) that employed two pairs of uncoupled driving wheels; the Drummond locomotives were always known as the "double singles". Five similar locomotives, numbers 369-373, were built in 1901 and classified E10.
588:
In 1905, number 720 was rebuilt with a larger boiler with the diameter increased by 5.25 in (0.133 m) to 4 ft 10.75 in (1.4923 m). The E10s were not rebuilt.
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T7: 16.5 in × 26 in (420 mm × 660 mm) later 14 in × 26 in (360 mm × 660 mm)
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Another unusual feature of the T7 and E10 locomotives was the valve gear. The valves for the inside cylinders were operated by
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Number 720 was a prototype locomotive built in 1897 and classified T7. The layout was unusual and influenced by
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The first engineer known to have adopted this solution was
Francis Webb, followed by
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18,062 lbf (80.34 kN) (with 14 in cylinders and at 80% boiler pressure)
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E10: 14 in × 26 in (360 mm × 660 mm)
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4,500 imp gal (20,000 L; 5,400 US gal)
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and the valves for the outside cylinders were operated by
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introduced in 1897. Five similar locomotives, classified
48:. Unsourced material may be challenged and removed.
1573:Standard gauge steam locomotives of Great Britain
639:
1544:
642:Locomotives at the Grouping 1, Southern Railway
600:E10, 5 locomotives built 1901, numbers 369-373
1311:Principal locomotives of the Southern Railway
1295:
680:
1553:London and South Western Railway locomotives
1458:West Country and Battle of Britain classes
1302:
1288:
687:
673:
619:An illustrated history of LSWR Locomotives
306:T7 rebuild: 61.05 long tons (62.03 t)
616:
549:
108:Learn how and when to remove this message
640:Casserley, H.C.; Johnston, S.W. (1974).
610:
597:T7, 1 locomotive built 1897, number 720
591:
1563:Railway locomotives introduced in 1897
1545:
627:LSWR Locomotives - a survey, 1873-1922
536:
1283:
668:
624:
46:adding citations to reliable sources
17:
304:T7: 54.55 long tons (55.43 t)
296:63 ft 9 in (19.43 m)
288:6 ft 7 in (2,010 mm)
277:3 ft 7 in (1,090 mm)
13:
1512:British Railways steam locomotives
1269:British Railways steam locomotives
559:Drummond's T7 and E10 worked with
514:
14:
1584:
1517:Great Western Railway locomotives
308:E10: 58.7 long tons (59.6 t)
696:London and South Western Railway
509:London and North Western Railway
485:London and South Western Railway
415:London and South Western Railway
128:
22:
1494:Mainline diesels 10201 to 10203
33:needs additional citations for
1489:Diesel shunters 15211 to 15236
633:
1:
604:
494:
1532:Southern Railway locomotives
1264:Southern Railway locomotives
7:
491:, were introduced in 1901.
10:
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507:introduced in 1883 on the
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617:Casserley, H.C. (1971).
475:was a prototype express
324:5 long tons (5.1 t)
1385:N15 (King Arthur) class
527:
1474:Diesel shunters 1 to 3
1259:LB&SCR locomotives
623:- Enlarged edition of
550:Drummond's locomotives
438:LSWR & SR: T7, 720
1467:Non-steam locomotives
1254:SE&CR locomotives
574:Stephenson valve gear
1499:Electrics CC1 to CC3
621:. London: Ian Allan.
592:Construction history
505:compound locomotives
430:LSWR, SR: T7 and E10
42:improve this article
1558:4-2-2-0 locomotives
1443:Merchant Navy class
537:Earlier experiments
383:Performance figures
123:LSWR/SR T7 and E10
1568:Duplex locomotives
1241:PD&SWRJ 0-6-0T
1236:PD&SWJR 0-6-2T
625:Burtt, F. (1949).
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1410:V (Schools) class
1370:Lord Nelson class
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747:J.H. Beattie
522:Duplex locomotive
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477:steam locomotive
419:Southern Railway
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1522:LMS locomotives
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515:Design features
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481:Dugald Drummond
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389:Tractive effort
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337:Boiler pressure
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247:4 ft
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170:Nine Elms Works
161:Dugald Drummond
144:Type and origin
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134:LSWR T7 4-2-2-0
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57:"LSWR T7 class"
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648:. p. 46.
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578:Joy valve gear
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210:Configuration:
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205:Specifications
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1127:
1125:
1122:
1120:
1119:H13 (railcar)
1117:
1115:
1112:
1110:
1107:
1105:
1104:H12 (railcar)
1102:
1100:
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1089:K11 (railcar)
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512:
510:
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492:
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486:
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470:LSWR Class T7
457:
453:
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449:Great Britain
447:
443:
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367:
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364:Cylinder size
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331:
327:
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321:Fuel capacity
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265:1,435 mm
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98:December 2015
90:
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69:
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62:
59: –
58:
54:
53:Find sources:
47:
43:
37:
36:
31:This article
29:
25:
20:
19:
16:
1438:Leader class
1224:
1220:
1213:
1209:
1078:
1048:
902:W.G. Beattie
890:
873:
866:
854:
847:
840:
833:
826:
819:
812:
805:
798:
791:
784:
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756:
735:
728:
721:
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641:
635:
626:
618:
612:
587:
571:
558:
540:
531:
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498:
488:
469:
467:
440:E10, 369-373
273:Leading dia.
104:
95:
85:
78:
71:
64:
52:
40:Please help
35:verification
32:
15:
1040:D. Drummond
698:locomotives
503:3-cylinder
344:(1.21
301:Loco weight
1547:Categories
1390:N15X class
1355:E1/R class
705:J.V. Gooch
655:0711005524
605:References
568:Valve gear
495:Background
479:design by
329:Water cap.
175:Build date
149:Power type
68:newspapers
1453:USA class
1337:S15 class
1332:N15 class
1327:H15 class
1221:Clausetum
1214:Bredwalda
1166:1912–1922
1042:1895–1912
948:1878–1895
904:1871–1878
749:1850–1871
707:1841–1850
646:Ian Allan
458:1926-1927
411:Operators
354:Cylinders
340:175
313:Fuel type
180:E10, 1901
1448:Q1 class
1405:U1 class
1380:N1 class
1365:L1 class
1347:Maunsell
1225:Ironside
946:W. Adams
891:Vesuvius
757:Hercules
736:Vesuvius
483:for the
261: in
214:
178:T7, 1897
157:Designer
1430:Bulleid
1420:Z class
1415:W class
1400:U class
1395:Q class
1375:N class
1231:Terrier
1164:R. Urie
874:Volcano
799:Minerva
792:Chaplin
729:Mazeppa
584:Rebuild
473:4-2-2-0
455:Retired
435:Numbers
256:⁄
236:2'AA n4
225:4-2-2-0
167:Builder
82:scholar
1223:&
1212:&
1210:Vulcan
855:Falcon
827:Undine
806:Nelson
778:Canute
771:Sussex
764:Tartar
652:
555:Boiler
445:Locale
406:Career
293:Length
283:Driver
192:E10, 5
84:
77:
70:
63:
55:
1484:11001
1479:D2341
848:Eagle
834:Clyde
820:Tweed
785:Saxon
722:Bison
715:Eagle
426:Class
242:Gauge
221:Whyte
190:T7, 1
152:Steam
89:JSTOR
75:books
1319:Urie
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