Standard Corridor
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| British Rail Second Corridor | |
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 A Mk1 Second Corridor (SK) coach at the North Norfolk Railway in 2007 |
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| In service | 1951- |
| Manufacturer | BR Derby, Wolverton, Gloucester RCW, C Roberts, & Metro Cammell |
| Operator | British Rail |
| Specifications | |
| Car length | 64ft 6in |
| Width | 9ft 3in |
| Height | 12ft 9 1/2in |
| Maximum speed | 80-100mph |
| Weight | 34 ton |
The Standard 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 standard class (previously third 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. At the same time, 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 (19452-19557).
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. Many SKs still operate in charter trains, and they remain popular on preserved railway lines.
[edit] Brake Standard Corridor
A standard corridor coach with a guard's brake compartment is designated BSK.
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