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These used steel plates about 1–2 in (25.4–50.8 mm) thick. They were mainly used in
Britain and continental Europe. On most locomotives, the frames would be situated within the driving wheels ("inside frames"), but some classes of an early steam locomotive and diesel
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These are openwork girder structures built up from steel or iron bars which are usually 4–7 in (100–180 mm) thick, welded into a single load-bearing assembly. They were first used on the
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or bodywork. The vast majority of locomotives have had a frame structure of some kind. The frame may in turn be supported by axles directly attached to it, or it may be mounted on
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282:, tend to have their strength in an internal structure. This style of construction is still popular elsewhere, but North American locomotives nowadays are overwhelmingly
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locomotive beds were a development of the final years of steam locomotive design in the United States. They were also exported to
Britain and Australia from the US.
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during the 1830s, and were widely used in nineteenth century
American locomotives (including those exported to Australia and New Zealand; see
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where the frame consisted of plates both inside and outside the driving wheels. Others were
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Diesel and electric locomotives with a traditional, full-width body, known as
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where the frame was constructed of wood sandwiched between two metal plates.
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Three main types of frame on steam locomotives may be distinguished:
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were constructed with "outside frames". Some early designs were
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342:(2001 republication ed.). Dover Publications, Inc.
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111:Chassis for a self-propelled railway vehicle
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251:with no fixed wheels (i.e. excluding the
169:Preserved GWR 9017 showing outside frames
38:Relevant discussion may be found on the
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376:This locomotive-related article is a
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380:. You can help Knowledge (XXG) by
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319:Rigid-framed electric locomotive
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120:LNER Gresley Pacific locomotive
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338:Ransome-Wallis, P. (1959).
309:Steam locomotive components
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216:Bury Bar Frame locomotive
237:Articulated locomotives
249:articulated locomotive
243:Articulated locomotive
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421:Categories
325:References
314:Underframe
292:cowl units
284:hood units
231:Cast steel
210:locomotive
198:Bar frames
135:locomotive
70:newspapers
276:cab units
269:monocoque
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298:See also
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100:May 2024
304:Chassis
132:railway
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261:diesel
147:bogies
143:boiler
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