| 词条 | Hertford Loop Line | ||||||||||||||||||||||||||||||
| 释义 |
|name = Hertford Loop Line |color = |logo = |logo_width = |image = 313046 030 ENC 02.jpg |image_width = 300px |caption = First Capital Connect Class 313 at {{stnlnk|Enfield Chase}} |type = Heavy rail |system = National Rail |status = Operational |locale = Greater London East of England |start = {{stnlnk|London Moorgate}} |end = {{stnlnk|Stevenage}} |stations = 11 |routes = 1 |daily_ridership = |open = 1871—1924 |close = |owner = Network Rail |operator = Great Northern |character = |depot = Hornsey EMUD |stock = Class 313 |linelength = {{convert|24|mi|km|abbr=on}} |tracklength = |tracks = 2 |gauge = {{RailGauge|sg|allk=on}} |load_gauge = W9 |availability = RA 7-9 |electrification = 25 kV AC OHLE |speed = Maximum {{convert|75|mph|km/h|abbr=on}} |elevation = }}{{Hertford Loop Line}} The Hertford Line[1][2] (also known colloquially as the Hertford Loop) is a branch of the East Coast Main Line, part of the Northern City Line commuter route to London for Hertford and other Hertfordshire towns and an occasional diversion route for the main line. The line is part of the Network Rail Strategic Route 8, SRS 08.03 and is classified as a London and South East Commuter line.[3] OperationsGreat Northern operates suburban services along the Hertford Line between London King's Cross or Moorgate, and Letchworth, Stevenage, Hitchin or Hertford North. Occasionally, London North Eastern Railway, Hull Trains, Grand Central and other faster Great Northern services operate non-stop along the route when diverted off the main section of the East Coast Main Line, due to engineering work. There is a reversing siding to the north of Bowes Park which is occasionally used to reverse London North Eastern Railway trains heading for the Bounds Green Depot. There are also bay platforms at Hertford North and Gordon Hill, the latter acting as a terminus during peak hours and night only. InfrastructureThe line is about {{convert|24|mi}} long, is double track throughout and is electrified at 25 kV AC using overhead line equipment. It has a loading gauge of W9 and a maximum line speed of {{convert|75|mph|km/h|abbr=on}}.[3] Grade-separated junctions connect each end of the northbound track with the main line. All stations are long enough to accept two, three-car (20m) EMUs. Tunnels and viaductsMajor civil engineering structures on the Hertford Line include the following.[4]
European Rail Traffic Management System trials on the Hertford LineNetwork Rail is using Beacon Rail owned Class 313 unit 313121 as a test vehicle for ERTMS on the Hertford Line.[5] The plan involved resignalling a {{convert|5+1/2|mi|adj=on}} section of the double track route to allow existing passenger and freight services to work bi-directionally over the up Hertford line, freeing the down line for ERTMS tests and evaluation.[6]HistoryThe line was opened in three stages between 1871 and 1924. The first section called the Enfield Branch Railway was developed by the London and York Railway and went from Wood Green to Enfield.[7] In 1898, a plan was approved to extend the line north to Hertford and Stevenage, in order to relieve congestion on the main line without having to widen the Welwyn Viaduct. Work started in 1905 and Cuffley was reached on 4 April 1910. The construction of two major viaducts and the Ponsbourne Tunnel (at {{convert|2684|yd|disp=or}}, the longest in the eastern counties of England and the last to be built by traditional methods), combined with World War I shortages of men and materials, delayed the opening of the route to Stevenage until 4 March 1918. Then it was single track and for goods services only. The line finally opened to passengers on 2 June 1924 when a new Hertford North Station was opened.[8] The line was electrified in 1977.[9] The line was also used frequently during the Second World War as the Welwyn/Digswell viaduct was at high risk from bombs Route and settlements servedThe Hertford Line leaves the East Coast Main Line at Langley junction,[1] just south of Stevenage.
It rejoins the East Coast Main Line at Wood Green South junction,[10] north of Alexandra Palace railway station. References1. ^1 {{cite book |author=Network Rail |authorlink=Network Rail |title=London North East Route Sectional Appendix|volume=Module LNE1 |date=2006-12-02 |id=NR30018/01a |page=46}} 2. ^Quail Map 2 - England: East [page 24] Feb 1998 (Retrieved 2014-04-12) 3. ^1 {{cite web|url=http://www.networkrail.co.uk/browse%20documents/StrategicBusinessPlan/RoutePlans/2009/Route%208%20-%20East%20Coast%20Main%20Line.pdf|title=Route 8 - East Coast Main Line|publisher=Network Rail|year=2009|accessdate=2009-06-01}} 4. ^{{Cite book|title=Railway Track Diagrams Book 2: Eastern|last=Brailsford|first=Martyn|publisher=Trackmaps|year=2016|isbn=978-0-9549866-8-1|location=Frome|pages=14, 24}} 5. ^{{cite web|url=http://www.riagb.org.uk/files/update/RIA%20Update%2052.pdf |title=Railway Industry Association: Update #52 page 6 |accessdate=4 March 2011 }}{{dead link|date=April 2017 |bot=InternetArchiveBot |fix-attempted=yes }} 6. ^{{cite journal |magazine= Rail Magazine|volume= 664|issue= |title=The signal for change|url=http://www.railmagazine.com/infrastructure/signalling/the-signal-for-change|date=22 February – 8 March 2011|accessdate=29 March 2015}} 7. ^A Regional History of the Railways of Great Britain (Vol. 3 Greater London), H P White, David & Charles Ltd 1971 (Pages 166-7) 8. ^A Regional History of the Railways of Great Britain (Vol. 5 The Eastern Counties), D I Gordon, David & Charles Ltd 1977 {{ISBN|0-7153-4321-1}} (Pages 123-4) 9. ^{{Cite web |url=http://www.pastscape.org/hob.aspx?hob_id=1368854&search=all&criteria=Haringey&p=4 |title=English Heritage Pastscape: Hertford Loop Line |access-date=20 August 2011 |archive-url=https://web.archive.org/web/20120406211818/http://www.pastscape.org/hob.aspx?hob_id=1368854&search=all&criteria=Haringey&p=4#aSt |archive-date=6 April 2012 |dead-url=yes |df=dmy-all }} 10. ^{{cite book |author=Network Rail |authorlink=Network Rail |title=London North East Route Sectional Appendix|volume=Module LNE1 |date=2006-12-02 |id=NR30018/01a |page=44}} Hornby, Frank (1995) London Commuter Lines. Volume 1: Main lines north of the Thames. Kettering: Silver Link Publishing Ltd. {{Great Northern Route}}{{Railway lines in the East of England}}{{Railway lines in London}} 8 : Rail transport in Hertfordshire|Railway lines opened in 1871|Railway lines in London|Railway loop lines|Railway lines in the East of England|Standard gauge railways in England|Transport in the London Borough of Enfield|Transport in the London Borough of Haringey |
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