Editing Hammersmith & City line (section)

==Route==
{{wide image|Hammersmith & City Line & London map.svg|850px|The Hammersmith & City line and the [[London boroughs]] served|center}}
The line is {{convert|25.5|km|mi|order=flip}} long with 29 stations, all of which are shared with other lines.<ref name="linefacts"/>

Almost all of its track is shared with the other London Underground sub-surface lines: from Hammersmith to Baker Street with the Circle line; from Baker Street to Liverpool Street with the Circle and Metropolitan lines; and from [[Aldgate East tube station|Aldgate East station]] to Barking with the District line. A short section between Paddington and Edgware Road is also shared with the District line, while a short section between Liverpool Street and Aldgate East is not shared with any other line.<ref name="map" />

The line is electrified with a four-rail DC system: a central conductor rail is energised at {{Val|-210|u=V}} and a rail outside the running rails at {{Val|+420|u=V}}, giving a potential difference of {{Val|630|u=V}}.<ref name="Martin2012">{{cite book |author= Martin, Andrew |title=Underground, Overground: A Passenger's History of the Tube |url= https://books.google.com/books?id=vh3n5WD_YqsC&pg=PT137 |access-date=7 December 2012 |date=26 April 2012 |publisher=Profile Books |isbn=978-1-84765-807-4 |pages=137–138}}</ref> 

Much of the {{convert|2|mi|35|chain|adj=on}} double-track railway from the [[Hammersmith tube station (Circle and Hammersmith & City lines)|Hammersmith terminus]] to [[Westbourne Park tube station|Westbourne Park station]] is on a {{convert|20|ft|adj=on}} high brick viaduct.{{sfn|Jackson|1986|p=38}} After Westbourne Park the line passes beneath the [[Great Western Main Line]] re-surfacing at [[Royal Oak tube station|Royal Oak station]] and running alongside the main lines to [[Paddington tube station (Circle and Hammersmith & City lines)|Paddington station]].<ref name="map">{{cite web|url=http://cartometro.com/cartes/metro-london/|title=Detailed London Transport Map|access-date=23 November 2012|work=cartometro.com}}</ref> The line enters a cutting just west of Paddington, with a cut-and-cover tunnel at the far eastern end of the platforms. It meets the Circle and District lines from Bayswater at Praed Street Junction before passing through Edgware Road station in a cutting. After [[King's Cross St Pancras tube station|King's Cross St Pancras]] the line is partly in cutting but mostly in the [[Clerkenwell Tunnel]]s, just after which it passes over the Ray Street Gridiron that carries the route over the [[City Widened Lines]] used for [[Thameslink (route)|Thameslink]] services.<ref name="map" />{{sfn|Jackson|1986|p=48}}{{sfn|Day|1963|pp=5, 8, 16–17}} There are bay platforms at [[Moorgate station|Moorgate]]. Just before Aldgate the line diverges from the Circle and Metropolitan lines, continuing eastwards to join the District line west of Aldgate East.<ref name="map" /> The line passes over the [[Windrush line]] (on the [[East London line]] railway) at Whitechapel station continuing on the {{convert|2|mi|adj=on}} former Whitechapel & Bow Railway to [[Bow Road tube station|Bow Road]] where it surfaces, and then to Bromley-by-Bow, where it runs alongside the London, Tilbury and Southend line from [[Fenchurch Street station|Fenchurch Street]]. At the next station, [[West Ham tube station|West Ham]], there is a transfer with the [[Jubilee line]], the [[Docklands Light Railway]] and [[London, Tilbury and Southend line]]. There is a bay platform at the next station, [[Plaistow tube station|Plaistow]], and the line terminates after two more stations at [[Barking station|Barking]].<ref name="map" />