Manchester Metrolink: Difference between revisions

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===Power supply===
The trams are electrically powered from 750 [[Volt|V]] [[Direct current|DC]] [[overhead line]]s.{{sfn|Ogden|Senior|1992|p=102}} Between 1992 and 2007, electricity for the Metrolink system was procured by the operator, based on price only.<ref name=case/> In 2007, GMPTE changed the contractual requirements to ensure that [[sustainable energy|sustainable power]] would be factored into choosing an energy supplier, and in July 2007, Metrolink became the first light rail network in the UK with electricity supplied entirely from sustainable energy via [[hydropower]].<ref name=case/> Now, energy for the system is generated by biomass.<ref>{{cite web|url=http://www.tfgm.com/t2k/Pages/TfGM-Green-Facts.aspx|title=Pages – TfGM Green Facts|access-date=24 December 2014|archive-url=https://web.archive.org/web/20141225012132/http://www.tfgm.com/t2k/Pages/TfGM-Green-Facts.aspx|archive-date=25 December 2014|url-status=dead}}</ref>
 
===Signalling===
[[File:Disused Repeater Signal 51 near Collyhurst Tunnel.jpg | thumb | 220x124px | right | alt= Repeater Signal. | Disused Two Aspect Repeater Signal near Victoria Tram Stop.]]Phase one and Phase two had 2 types of signals, [[Line of sight]] signals and [[UK railway signalling|Two Aspect colour signals]].<ref>https://www.lrta.info/archive/Manchester/signalling.html</ref> These signals were controlled with a device called the Vehicle Recognition System (VRS) inside the cab, which sent information to the control room by a pair of coils on the un-motored centre bogie. <ref>https://www.lrta.info/archive/Manchester/signalling.html</ref> Phase 3 introduced a new device called the Tram Management System (TMS) as the Two Aspect colour signals would not be able to support the headway between trams (zero minutes) and the level of flexibility required. This meant that every line would become fully Line of sight. <ref>https://www.lrta.info/archive/Manchester/tram_ms.html</ref> The Two Aspect colour signals were removed between 2012-2022 as more and more lines were being converted to Line of sight. The one bit of line that cannot be converted is the Altrincham line from Timperley-Altrincham, as that section is under network rail control. <ref>https://www.lrta.info/archive/Manchester/signalling.html</ref>
 
===Depots===