Annett's key: Difference between revisions
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[[File:Ground frame kyle.jpg|thumb|upright|Groundframe, with the two rightmost levers locked by Annett's key]] |
[[File:Ground frame kyle.jpg|thumb|upright|Groundframe, with the two rightmost levers locked by Annett's key]] |
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In British, Australian, French, and Swiss [[railway signalling]], an '''Annett's key''' is a form of [[trapped-key interlocking]] that locks [[Lever frame|levers]] or other items of signalling apparatus, thereby serving as a portable form of [[interlocking]]. |
In British, Australian, French, and Swiss [[railway signalling]], an '''Annett's key''' is a form of [[trapped-key interlocking]] that locks [[Lever frame|levers]] or other items of signalling apparatus, thereby serving as a portable form of [[interlocking]]. The purpose is to prevent access from sidings to the running line without authority.<ref>{{cite book |title=Hebel, Riegel und Signale |trans-title=Levers, Bolts and Signals |language=gsw |first=Hans G. |last=Wägli |publisher=Diplory Verlag |isbn=9783033064102 |date=2018 |pages=159, 176 }}</ref> When not in use, the key is normally held in an '''Annett's lock''' that is fixed to the lever or concerned apparatus.<ref name="Brookfield Rail 2016 p6" /> |
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== History == |
== History == |
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The Annett's key takes its name from its inventor, J. E. Annett of the [[London, Brighton and South Coast Railway]]. Annett [[patent]]ed his design in 1875; in 1881 that patent was bought out by [[Saxby and Farmer]].<ref>{{cite book |last=Foster |first=Richard D. |title=A Pictorial Record of L.N.W.R. Signalling |page=166 |publisher=Oxford Publishing Co. |date=1982 |isbn=9780860931478 }}</ref> |
The Annett's key takes its name from its inventor, J. E. Annett of the [[London, Brighton and South Coast Railway]]. Annett [[patent]]ed his design in 1875; in 1881 that patent was bought out by [[Saxby and Farmer]].<ref>{{cite book |last=Foster |first=Richard D. |title=A Pictorial Record of L.N.W.R. Signalling |page=166 |publisher=Oxford Publishing Co. |date=1982 |isbn=9780860931478 }}</ref> |
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==Operation== |
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In British usage, the key may be held in a locked container in the signal box that can only be opened when the corresponding signal lever is turned to ''danger'' for traffic on the running line; the lever is locked in position until the key is returned. Alternatively, the key may be attached to the [[Token (railway signalling)|train staff]] for the section of running line containing the entrance to the siding.<ref>{{cite book |title=Bulletin of the International Railway Congress Association |date=1909 |publisher=Weissenbruch |location=Brussels |page=1494|volume=23|oclc=751736585}}</ref><ref>{{cite book |title=[[The English Mechanic and World of Science]] |date=1878 |location=London |oclc=1567968 |page=291 |volume=27}}</ref> In Australian usage, the key is carried on a specified locomotive.<ref name="Brookfield Rail 2016 p6">{{cite web |title=Network Safeworking Rules and Procedures: Annett's Keys |url=http://www.arcinfra.com/ARCInfrastructure/media/documents/NetworkSafeworking/9026-Annett-s-Keys-version-1-0.pdf |website=ArcInfra.com |publisher=[[Arc Infrastructure|Brookfield Rail]] |page=6 |date=31 March 2016 |access-date=31 August 2021 }}</ref> |
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== See also == |
== See also == |
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* [[Glossary of rail transport terms]] |
* [[Glossary of rail transport terms]] |
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Revision as of 15:02, 23 March 2022
In British, Australian, French, and Swiss railway signalling, an Annett's key is a form of trapped-key interlocking that locks levers or other items of signalling apparatus, thereby serving as a portable form of interlocking. The purpose is to prevent access from sidings to the running line without authority.[1] When not in use, the key is normally held in an Annett's lock that is fixed to the lever or concerned apparatus.[2]
History
The Annett's key takes its name from its inventor, J. E. Annett of the London, Brighton and South Coast Railway. Annett patented his design in 1875; in 1881 that patent was bought out by Saxby and Farmer.[3]
Operation
In British usage, the key may be held in a locked container in the signal box that can only be opened when the corresponding signal lever is turned to danger for traffic on the running line; the lever is locked in position until the key is returned. Alternatively, the key may be attached to the train staff for the section of running line containing the entrance to the siding.[4][5] In Australian usage, the key is carried on a specified locomotive.[2]
See also
References
- ^ Wägli, Hans G. (2018). Hebel, Riegel und Signale [Levers, Bolts and Signals] (in Swiss German). Diplory Verlag. pp. 159, 176. ISBN 9783033064102.
- ^ a b "Network Safeworking Rules and Procedures: Annett's Keys" (PDF). ArcInfra.com. Brookfield Rail. 31 March 2016. p. 6. Retrieved 31 August 2021.
- ^ Foster, Richard D. (1982). A Pictorial Record of L.N.W.R. Signalling. Oxford Publishing Co. p. 166. ISBN 9780860931478.
- ^ Bulletin of the International Railway Congress Association. Vol. 23. Brussels: Weissenbruch. 1909. p. 1494. OCLC 751736585.
- ^ The English Mechanic and World of Science. Vol. 27. London. 1878. p. 291. OCLC 1567968.
{{cite book}}: CS1 maint: location missing publisher (link)