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The '''BR Mark 1 Standard class corridor coach (SK) ''' was the most numerous carriage design ever built in the UK, with 2,168 produced between 1951 and 1963. Seating withing the eight compartments was of the interior sprung bench type. There were two main variants:
*Those built for the Midland, Scottish, and Eastern / North Eastern regions had six seats per compartment, with fold-up arm-rests
*Those built for the Southern and Western regions, which saw heavy commuter loadings into London, had eight seats per compartment, with no arm-rests.
Following the introduction of TOPS in the late 1960s, BR carriages of this class were allocated the [[TOPS code]] '''AA21''', denoting:
A: Passenger carrying stock<br>
A: Gangwayed corridor<br>
2: Second (later standard) class<br>
1: BR Mark 1 carriage
Four of the SVR's Corridor Second carriages have been converted for static use as staff accommodation at [[Bridgnorth]].
