Standard Corridor

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The Standard Corridor (previously Third Corridor, then Second 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/second class), linked by a side corridor.

The British Railways produced 'Mark 1' version 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.

Coaching stock of British Rail Mark 1 - Mark 2 - Mark 3 - Mark 4
	Passenger coaches
Mark 1:	BCK - BFK - BSK - BSO - BSOT - CK - FK - FO - RB - RBR - RF - RKB - RMB RU - SK - SLC - SLF - SLSTP - SO - TSO
Mark 2:	BFK - BSK - BSO - BSOT - BUO - DBSO - FK - FO - FOT - PFB - PFK - PFP RFB - RLO - RMBF - RSS - SK - SO - TSO - TSOT
Mark 3:	BFO - CO - FO - RFM - SLE - SLEP - TSO - TSOB (Locomotive-hauled) TF - TGS - TRB - TRFB - TRFK - TRSB - TS (HST trailers)
Mark 4:	FO - RBF - RSB - TSO - TSOE
	Non-passenger coaches
Mark 1	BG - BPOT - BV - Courier - GUV - PCV - POS - POT
Mark 3 & 4:	DVT	edit