Pocket track

A pocket track embedded between two main lines on the Washington Metro.

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]

Pocket tracks also allow for the short-lining 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." Updated 2011-08-29.
  2. Railway Technical Web Pages, UK. "US-UK Railway Terminology." 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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