First Corridor

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The First Corridor type of railway carriage was one of the standard mid-20th century designs; coded 'FK' by the LNER and BR, and 'CL' by the LMS. The layout of the coach was a number of compartments, all of which were first class, linked by a side corridor.

The British Railways produced versions (of Mark 1 and Mark 2 variations up to Mark 2D inclusive) were numbered in the 13xxx series. The prototype Mark 2 carriage, number 13252, was of FK design. It is now preserved at the National Railway Museum in York.

A number of the Mark 2A/2B/2C carriages were declassified in 1985 to become Standard Corridors (coded SK). 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 first class compartments. As of 2006, there are only 26 remaining in service, but these will remain so for the foreseeable future. They are two class 421 3CIG units, and 24 class 442 Wessex Electrics intercity units. Hastings Diesels Limited has some such coaches and occasionally stand in for Southern Services. Many FKs 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