Pocket track

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

A pocket 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]


  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.