World Library  
Flag as Inappropriate
Email this Article

Headshunt

Article Id: WHEBN0005561623
Reproduction Date:

Title: Headshunt  
Author: World Heritage Encyclopedia
Language: English
Subject: Siding (rail), Junction (rail), Track geometry, Split platform, Beijing Railway Station
Collection: Railway Sidings
Publisher: World Heritage Encyclopedia
Publication
Date:
 

Headshunt

Platform track and run-round loop at Toyooka Station, Hyōgo, Japan, the terminus of the line from Miyazu

A headshunt (US: escape track) is a short length of track, provided to release locomotives at terminal platforms, or to allow shunting to take place clear of main lines.

Contents

  • Terminal headshunt 1
  • Reversing headshunt 2
  • Shunting neck 3
  • Run-round 4
    • Examples 4.1
  • References 5

Terminal headshunt

A terminal headshunt is a short length of track that allows a locomotive to uncouple from its train, move forward, and then run back past it on a parallel track. Such headshunts are typically installed at a terminal station to allow the locomotive of an arriving train to move to the opposite end of (in railway parlance, 'run around') its train, so that it can then haul the same train out of the station in the other direction.

Reversing headshunt

Melbourne University tram stop has three reversing headshunts in succession, between the two running lines.

Found primarily on metro systems, rapid transit light rail networks, and tramways, a reversing headshunt allows certain trains or trams to change direction, even on lines with high traffic flow, whilst others continue through the station. Typically there will be two running lines, one for each direction of travel, and the headshunt will be positioned between the two running lines, linked to both by points. Although most trains will pass through the station and continue in the same direction, an individual train may be directed into the reversing headshunt, before exiting onto the other running line, in the opposite direction of travel. This procedure allows a greater frequency of trains on a city-centre section of the line, and reduced frequency on the suburban sections, by allowing certain trains to shuttle back and forth only on the city centre part, using the reversing headshunts to change direction within the flow of trains.

Shunting neck

The term headshunt may also refer to shunting neck or shunt spur: a short length of track laid parallel to the main line for the purpose of allowing a train to shunt back into a siding or rail yard without occupying the main running-line.

Run-round

Sketch of a headshunt and run-round loop

A run-round loop (or run-around loop) is a track arrangement that enables a locomotive to attach to the opposite end of the train. This process is known as "running round a train".[1] It is commonly performed to haul wagons onto a siding, or at a terminal station to prepare for a return journey.[2]

Although a common procedure for passenger trains when the majority of them were locomotive-hauled, the manoeuvre is now becoming rarer on public service railways. Increased use of multiple unit and push-pull passenger services avoids the requirement for dedicated track and the need for railway staff to detach and reattach the locomotive at track level. However, on heritage railways run-round loops are still usually more or less necessary at each end of the running line, partly because train services are usually locomotive-hauled, and partly because the run-round operation gives added interest to visitors.

Examples

Stations which used to have run-rounds include:

Stations which still have run-rounds include:

References

  1. ^ Ellis, Iain (2006). Ellis' British Railway Engineering Encyclopaedia. Lulu.com. p. 307.  
  2. ^ Jackson, Alan A. (2006). The Railway Dictionary (4th ed.). Sutton Publishing Ltd. p. 298.  
This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and USA.gov, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for USA.gov and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
 
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
 
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.
 


Copyright © World Library Foundation. All rights reserved. eBooks from Project Gutenberg are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.