World Library  
Flag as Inappropriate
Email this Article

Fishplate

Article Id: WHEBN0002640390
Reproduction Date:

Title: Fishplate  
Author: World Heritage Encyclopedia
Language: English
Subject: Track (rail transport), Rail fastening system, William Bridges Adams, First Transcontinental Railroad, Fish plate
Collection: Permanent Way
Publisher: World Heritage Encyclopedia
Publication
Date:
 

Fishplate

This article relates to the connection bar used in railways. For the type of Greek pottery, see Fish plate.
Fishplate on the Bluebell Railway

In rail terminology, a fishplate, splice bar or joint bar is a metal bar that is bolted to the ends of two rails to join them together in a track. The name is derived from fish, a wooden bar with a curved profile used to strengthen a ship's mast.[1] The top and bottom edges are tapered inwards so the device wedges itself between the top and bottom of the rail when it is bolted into place.[2] In rail transport modelling, a fishplate is often a small copper or nickel silver plate that slips onto both rails to provide the functions of maintaining alignment and electrical continuity.

Contents

  • History 1
  • Electrical connection 2
  • Welded rail 3
  • Turnouts 4
  • Brétigny-sur-Orge Accident 5
  • Examples of fishplates 6
  • See also 7
  • References 8
  • External links 9

History

The first railway fishplate, patented by William Adams and Robert Richardson in 1847

The device was invented by William Bridges Adams[3] in May 1842, because of his dissatisfaction with the scarf joints and other systems[4] of joining rails then in use. He noted that to form the scarf joint the rail was halved in thickness at its ends, where the stress was greatest.[5] It was first deployed on the Eastern Counties Railway in 1844, but only as a wedge between the adjoining rails. Adams and Robert Richardson patented the invention in 1847,[6] but in 1849 James Samuel, the engineer of the ECR developed fishplates that could be bolted to the rails.[7]

Electrical connection

Electrically bonded main line 6-bolt rail joint on a segment of 155 lb/yd (76.9 kg/m) rail

When railway lines are equipped with track circuits, or where the line is electrified for electric traction, the electrical connection provided by fishplates is poor and unreliable and has to be supplemented by bonding wire fixed to the two rails either side of the joint by spot welding or other means.

Welded rail

Even though fishplates strengthen the weak points represented by rail joints, improvements can still be made. For example, the joints can be welded together using the thermite welding process. In 1967, at Hither Green on the Southern Region of British Railways, a major disaster occurred when a rail fractured at its fishplate joint. Welded Rail installation was sped up due to this error, with strict procedures on Concrete and Wooden Sleepers.

Turnouts

The moving blades of a set of points can be connected to the stock rails by looser than normal fishplates. This is called a heeled switch. Alternatively, the blade and stock rail can be a one piece heel-less switch, with a flexible thinned section to create the moving heel.

Brétigny-sur-Orge Accident

On 12 July 2013, the last four cars of an SNCF Paris-Limoges train left the track [8]

Examples of fishplates

A connector that matches rails of different heights 
Fishplate and electrical connecting wire 
Pennsylvania RR standard joint 
Portec insulated fishplate 
Short rail, sometimes known as a "Dutchman
Old fishplate 
Shorter Pennsylvania RR standard joint 
Rusty line across end of the left-hand rail, indicates right-hand rail is higher (mismatch) 

See also

  • Rail lengths - rails are made as long as possible to minimise the number of fishplates.
  • Tie plate
  • Henry Williams Limited

References

  1. ^ "Fish 2".  
  2. ^ Morgan, C. D. (1946). "Permanent way". In Pendred, Loughan. The Engineer's Year-Book for 1946 (52 ed.). London: Morgan Brothers. p. 2015. 
  3. ^ Ransom, P. J. G. (1990). The Victorian Railway and How it Evolved. London : Heinemann. p. 224.
  4. ^ Ransom, P. J. G. (1990). The Victorian Railway and How it Evolved. London : Heinemann. pp. 224 - 229.
  5. ^ Manby, Charles (ed.) (1857). "Permanent Way". Minutes of proceedings of the Institution of Civil Engineers (London: Institution of Civil Engineers) XV1: 289. 
  6. ^ Manby (1857: 273)
  7. ^ Marshall, C.F. Dendy; revised by R. W. Kidner (1963). A history of the Southern Railway Vol.1. London: Ian Allan. p. 212. 
  8. ^ "Loose bolts to blame for Brétigny derailment". Railway Gazette. 
  • Ellis, C. Hamilton (1958). Twenty Locomotive Men, Ian Allan Ltd, London.

External links

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.