Pocket track

A pocket track, tail track, or reversing siding (UK: centre siding) is a rail track layout which allows trains to park off the main line. This type of track layout differs from a passing loop in that the pocket track is usually located between two main lines, rather than off to the side.[1][2][3]

A pocket track on the eBART line
CityLynx Gold Line Birney car laying over at CTC-Arena, viewed from the Lynx light rail station, 2016

Pocket tracks also allow for the short-turning of trains, truncating services at an intermediate station to control train frequency.[4] They are also used at terminal stations to allow for the construction of future extension of a rail track without disrupting existing service.[5]

References
  1. Railway Technical Web Pages, UK. "Glossary: Centre Siding." Archived 2014-10-07 at the Wayback Machine Updated 2011-08-29.
  2. Railway Technical Web Pages, UK. "US-UK Railway Terminology." Archived 2010-11-28 at the Wayback Machine Updated 2011-08-29.
  3. TriMet MAX (Metropolitan Area Express), Portland, Oregon."Types of track layouts." Max FAQs. 2010-12-17.
  4. "Pocket Tracks" (PDF). Metro 2025: Strategic Plan, 2013-2025 (Report). Washington Metropolitan Area Transit Authority. p. 67. Retrieved August 8, 2016.
  5. "Northgate Station" (PDF). Sound Transit. July 2012. Archived from the original (PDF) on October 2, 2015. Retrieved August 8, 2016.


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