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277:, or simple, articulated steam engines had two sets of equally sized cylinders. High-pressure steam was supplied to all cylinders and exhausted out of the stack once it had been used. The American simple-expansion articulated, thanks largely to the smaller mass of the forward cylinders when compared to the compound-expansion Mallets allowing for higher piston speed, were generally better suited for high speed than their compound cousins. Examples of the "simple mallet" design include the
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and consequently heavier pistons caused stability issues at higher speed, which generally limited compound expansion articulated locomotives to below 30 or 40 miles per hour. A notable exception to this was to be found in later iterations of
Norfolk & Western Y-class 2-8-8-2s, which could and did often exceed 50 miles per hour in service as well as being one of the hardest-pulling steam locomotives ever built.
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323:'s original idea, consist of two sets of unequally sized cylinders. The smaller pair of cylinders near the cab was fed with high pressure steam directly from the boiler and then the steam was passed into a pair of low-pressure cylinders at the front, with larger diameter to offset the lower pressure, before exhausting through the smokestack. While the
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was greatly improved through the compound use of steam in Mallet designs, the large low-pressure cylinders posed unique limitations, both in terms of loading gauge (the cylinders could only be as large as the track and track-side infrastructure allowed) and in terms of performance at speed. The large
131:) with one or more engine units that can move independently of the main frame. Articulation allows the operation of locomotives that would otherwise be too large to negotiate a railroad's curves, whether mainlines or special lines with extreme curvature such as
261:, with two powered engine trucks under the locomotive (generally with the cylinders inward). Also, the Kitson-Meyer variant with the trucks spread apart to allow a deeper
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The conventional electric and diesel locomotive dual bogie design uses the same general configuration as the Meyer design but is not considered to be articulated.
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were also compound locomotives, but were complicated as a result. All subsequent
Garratts were simple engines only.
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types, the latter largely used in logging, mining and industry. Most other types saw only limited success.
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Three sections, where the middle part sits on the two outer parts (similar to the
Garratt design), e.g.
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As distinct from articulated locomotives, a non-articulated locomotive is referred to as a
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Side profile shot of Big Boy no. 4014, an articulated simple expansion steam locomotive
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in Europe. The largest examples were developed in the United States, where the
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single-boiler derivative with one powered and one unpowered truck (known as a
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Articulated locomotives saw service in many nations, but were very popular on
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and its simple-expansion derivative were the most popular, followed by the
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Many schemes for articulation were developed over the years. Of these, the
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remaining as the largest, and last of its kind to still operate.
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were some of the largest steam locomotives ever built, with
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Steam locomotive wheel arrangements (Whyte notation)
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104:Three methods of articulating a steam locomotive
57:but its sources remain unclear because it lacks
331:The first Garratt locomotives constructed, the
216:The major types of articulated locomotive are:
319:, or compound, articulated steam engines like
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8:
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430:There are several classes of articulated
224:, with two powered trucks under a double
88:Learn how and when to remove this message
343:There were various types of articulated
188:and European colonies), and the various
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471:Two sections which share a central or
491:, a derivative of E.636 operating in
333:Tasmanian Government Railways K class
7:
581:Articulated steam bogie locomotives
207:Articulated steam locomotive types
25:
495:- also known as SŽ series 362 in
293:"Yellowstones", the majority of
34:
1:
514:operating in Italy since 1975
508:in Italy, first built in 1958
287:Chesapeake and Ohio class H-8
555:Kalmbach Publishing Company
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553:, 1930, reprinted 1970 by
518:Rhaetian Railway Ge 6/6 II
176:type (mostly built in the
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442:Milwaukee Road class EP-2
499:and as JŽ series 362 in
434:of generally two types:
43:This article includes a
1455:Articulated locomotives
1330:Articulated locomotives
1320:2-4-4-2+2-8-8-2+2-4-4-2
1262:Articulated locomotives
1133:Articulated locomotives
1022:Articulated locomotives
576:Articulated locomotives
551:Articulated Locomotives
345:geared steam locomotive
190:geared steam locomotive
72:more precise citations.
18:Articulated locomotives
1460:Steam locomotive types
1422:Other notation forms:
415:Krauss-Helmholtz bogie
379:du Bousquet locomotive
279:Union Pacific Big Boys
157:and the Allegheny H-8
113:
105:
1296:0-6-2+2-4-2-4-2+2-6-0
485:, first built in 1940
448:crocodile locomotives
367:Willamette locomotive
303:Norfolk & Western
180:, popular throughout
152:Union Pacific Big Boy
148:narrow-gauge railways
111:
103:
527:New Zealand EW class
465:de:DRB-Baureihe E 94
432:electric locomotives
426:Electric locomotives
624:Single engine types
129:electric locomotive
1387:Geared locomotives
1313:2-10-10-10-10-10-2
384:Engerth locomotive
357:Heisler locomotive
325:thermal efficiency
317:Compound expansion
312:Compound expansion
245:Garratt locomotive
114:
106:
45:list of references
27:Type of locomotive
1442:
1441:
456:de:SBB Ce 6/8 III
420:Luttermöller axle
399:Hagans locomotive
352:Climax locomotive
252:Mallet locomotive
170:Mallet locomotive
141:mountain railways
98:
97:
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16:(Redirected from
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610:
603:
596:
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549:Wiener, Lionel,
531:English Electric
452:de:SBB Ce 6/8 II
405:(Hagans variant)
394:Golwé locomotive
295:Southern Pacific
275:Simple expansion
270:Simple expansion
259:Meyer locomotive
125:steam locomotive
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68:this article by
59:inline citations
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512:FS Class E.656
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479:FS Class E.636
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461:DRG Class E 94
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321:Anatole Mallet
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230:Single Fairlie
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178:United Kingdom
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53:external links
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958:engine types
550:
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473:Jacobs bogie
429:
342:
339:Geared types
330:
315:
299:Cab-forwards
273:
215:
203:locomotive.
200:
196:
194:
167:
163:Big Boy 4014
145:
127:(rarely, an
117:
115:
84:
75:
64:Please help
56:
1291:2-8-8-8-8-2
1123:4-8-4+4-8-4
1118:4-8-2+2-8-4
1113:4-8-0+0-8-4
1108:2-8-2+2-8-2
1103:2-8-0+0-8-2
1096:4-6-4+4-6-4
1091:4-6-2+2-6-4
1086:4-6-0+0-6-4
1081:2-6-2+2-6-2
1076:2-6-0+0-6-2
1071:0-6-2+2-6-0
1066:0-6-0+0-6-0
1059:4-4-2+2-4-4
1054:2-4-2+2-4-2
1049:2-4-0+0-4-2
1044:0-4-0+0-4-0
529:, built by
522:Switzerland
373:Other types
283:Challengers
234:Mason Bogie
212:Major types
119:articulated
70:introducing
1449:Categories
1410:Willamette
1268:and other
680:(monorail)
543:References
501:Yugoslavia
411:locomotive
301:, and the
137:industrial
121:locomotive
78:April 2015
1284:2-8-8-8-4
1279:2-8-8-8-2
1270:Multiplex
1252:2-10-10-2
228:, or its
980:2-2-4-0T
533:in 1952.
497:Slovenia
197:straight
159:2-6-6-6s
155:4-8-8-4s
1405:Heisler
1365:0-6-4-0
1334:Engerth
1266:Triplex
1245:4-8-8-4
1240:4-8-8-2
1235:2-8-8-4
1230:2-8-8-2
1225:2-8-8-0
1220:0-8-8-0
1215:0-8-6-0
1208:4-6-6-4
1203:4-6-6-2
1198:4-4-6-2
1193:2-6-8-0
1188:2-6-6-6
1183:2-6-6-4
1178:2-6-6-2
1173:2-6-6-0
1168:0-6-6-0
1161:2-4-4-2
1156:2-4-4-0
1151:0-4-4-2
1146:0-4-4-0
1035:Garratt
1026:Fairlie
1012:4-6-4-4
1007:4-4-6-4
1002:6-4-4-6
997:4-4-4-4
992:2-4-6-2
985:4-2-2-0
975:2-2-2-2
970:2-2-2-0
965:0-2-2-0
691:0-4-0+4
493:Croatia
475:, e.g.
306:A-class
291:2-8-8-4
263:firebox
236:in the
222:Fairlie
174:Garratt
133:logging
66:improve
1400:Climax
1137:Mallet
956:Duplex
941:4-14-4
934:4-12-2
929:2-12-4
924:2-12-2
919:2-12-0
914:0-12-0
907:4-10-2
902:4-10-0
897:2-10-4
892:2-10-2
887:2-10-0
882:0-10-2
877:0-10-0
820:0-8-4T
788:2-6-6T
768:0-6-6T
726:2-4-6T
721:2-4-4T
706:0-4-6T
701:0-4-4T
666:4-2-4T
651:2-2-4T
561:
446:Swiss
289:, the
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91:)
85:(
80:)
76:(
62:.
20:)
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