page_title: Standard Corridor
hierarchical_section_title: Standard Corridor
caption_attribution_description: English: BR Mk1 SK carraige. Watermark badly removed by Ali'i on 15:26, 13 March 2008 (UTC)
context_page_description: The Second Corridor type of railway carriage was one of the standard mid-20th century designs, and was coded SK by the LNER and BR, and CF by the LMS. The layout of the coach was a number of compartments, all of which were second class, linked by a side corridor.
  The British Railways produced Mark 1 SK was the most numerous carriage design ever built in the United Kingdom. The original number series carried was 24000–26217. From 1983, those carriages in the 25xxx and 26xxx series were renumbered 18xxx and 19xxx.
  There were two variants, those built for the Midland, Scottish, and Eastern / North Eastern regions had six seats per compartment, with fold-up arm-rests which folded into the seat-back, while those built for the Southern and Western regions, with their heavy commuter loadings into London, had eight seats in each compartment, and no arm-rests. Seating was of the interior sprung bench type. Over time, some SKs and BSKs were re-allocated from other regions to the Western, who tended to try to stitch the arm-rests in the up position.
  In 1985, a number of Mark 2 First Corridor carriages were declassified to become SKs.
context_section_description: The Second Corridor (previously Third Corridor) type of railway carriage was one of the standard mid-20th century designs, and was coded SK (previously TK) by the LNER and BR, and CF by the LMS. The layout of the coach was a number of compartments, all of which were second class (known as third class until 1956), linked by a side corridor.
  The British Railways produced Mark 1 SK was the most numerous carriage design ever built in the United Kingdom. The original number series carried was 24000–26217. From 1983, those carriages in the 25xxx and 26xxx series were renumbered 18xxx and 19xxx.
  There were two variants, those built for the Midland, Scottish, and Eastern / North Eastern regions had six seats per compartment, with fold-up arm-rests which folded into the seat-back, while those built for the Southern and Western regions, with their heavy commuter loadings into London, had eight seats in each compartment, and no arm-rests. Seating was of the interior sprung bench type.  Over time, some SKs and BSKs were re-allocated from other regions to the Western, who tended to try to stitch the arm-rests in the up position.
  In 1985, a number of Mark 2 First Corridor carriages were declassified to become SKs. They were renumbered from 13xxx to 19xxx, putting them after the end of the Mark 1 range (19452–19560).
  No carriages of this type are still in daily use on the main line network, since open saloon carriages are now preferred by operating companies. However, some electric multiple units based on Mark 1 coaches have standard class compartments, such as Class 438. Many SKs still operate on preserved UK railway lines.
  Designations for second corridor carriages are as follows:
caption: A Mk1 Second Corridor (SK) coach at the North Norfolk Railway in 2007
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