Headstock (rolling stock)

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Buffer beam / headstock (painted red) fitted with buffers and chain coupler and air hoses on the front end of a German steam locomotive Lokomotive 85007 22.jpg
Buffer beam / headstock (painted red) fitted with buffers and chain coupler and air hoses on the front end of a German steam locomotive

A headstock of a rail vehicle is a transverse structural member located at the extreme end of the vehicle's underframe. The headstock supports the coupling at that end of the vehicle, and may also support buffers, in which case it may also be known as a buffer beam. [1] The headstocks form part of the underframe of a locomotive or a railroad car. The headstocks of locomotives, railcars and cabcars also support headlamps and the hoses for air brakes, vacuum brakes as well as the cables for train control and head end power.

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Length over headstocks

A commonly used measurement relating to a rail vehicle is its length over headstocks, which is the length of the vehicle excluding its couplings or buffers (if any). [2] Alternative expressions for length over headstocks are length over coupler pulling faces, usually applied to Janney couplers, and length over buffers .

See also

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<span class="mw-page-title-main">Brake van</span> Car that had brakes used by Guards which is usually placed at the end of the Train

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<span class="mw-page-title-main">Multiple-unit train control</span>

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<span class="mw-page-title-main">British Rail Class 73</span> British bi-mode locomotive

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<span class="mw-page-title-main">Steam locomotive components</span> Glossary of the main components of a typical steam locomotive

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<span class="mw-page-title-main">British Rail Class 85</span>

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<span class="mw-page-title-main">Railway coupling</span> Mechanism for connecting rolling stock in a train

A coupling or coupler is a mechanism, typically located at each end of a rail vehicle, that connects them together to form a train. The equipment that connects the couplers to the vehicles is the draft gear or draw gear, which must absorb the stresses of the coupling and the acceleration of the train.

<span class="mw-page-title-main">Railway brake</span> Component of railway rolling stock

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<span class="mw-page-title-main">Buffer (rail transport)</span>

A buffer is a part of the buffers and chain coupler system used on the railway systems of many countries, among them most of those in Europe, for attaching railway vehicles together.

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<span class="mw-page-title-main">SA3 coupler</span> Automatic coupler for railway use

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Electronically controlled pneumatic brakes are a type of railway braking systems.

Janney couplers are a semi-automatic form of railway coupling that allow rail cars and locomotives to be securely linked together without rail workers having to get between the vehicles. They are also known as American, AAR, APT, ARA, MCB, knuckle, Buckeye, tightlock or Centre Buffer Couplers.

<span class="mw-page-title-main">Norwegian coupling</span>

A Norwegian coupling or coupler, is a manually operated coupling at each end of some narrow-gauge railway rolling stock. It consists of a central buffer incorporating a hook that drops into a slot in the opposing central buffer. The system is only found on narrow gauge railways with a gauge of 1067 mm or less on which low speeds and train loads allow a simpler system than, for example, knuckle couplers. Norwegian couplings are not particularly strong, and may be supplemented by auxiliary chains. Not all Norwegian couplings are compatible with one another since they vary in height and width. Some may permit a hook from both rail vehicles to be in place; others may be limited to one.

From time to time, a railway decides that it needs to upgrade its coupling system from one that is proving unsatisfactory, to another that meets future requirements. This can be done gradually, which can create many problems with transitional incompatibilities, or overnight, which requires much planning.

Buffers and chain couplers are the de facto International Union of Railways (UIC) standard railway coupling used in the EU and UK, and on some railways in other parts of the world, such as in South America and India, on older rolling stock. Buffers and chain couplers are an assembly of several devices: buffers, hooks and links, or turnbuckle screws.

<span class="mw-page-title-main">Dual coupling</span>

Different types of railroad rolling stock have different couplers depending on the purpose and type of equipment being used and its intended destination. European rolling stock tend to use buffers and chain couplers while American rolling stock uses a Janney coupler or "knuckle coupler". These are incompatible with each other, but where some railroads have obtained older, less expensive used rolling stock from different countries or regions, instead of having to standardize on one form of coupler, it may be useful to be able to use either type of coupler on a piece of rolling stock without having to remove anything.

References

  1. "Glossary". Railway Technical Web Pages. Archived from the original on 7 October 2014. Retrieved 29 August 2012.
  2. Ellis, Iain (2006). Ellis' British Railway Engineering Encyclopaedia. Raleigh, North Carolina: Lulu.com. p. 196. ISBN   1847286437.