# Standard Corridor

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British mid-20th century railway carriage

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British Rail Second Corridor A Mk1 Second Corridor (SK) coach at the North Norfolk Railway in 2007 In service 1951–present Manufacturers BR Ashford/Easteigh, Derby (C&W), Doncaster, Swindon, Wolverton, York, BRCW, Cravens, GRCW, & Metro Cammell Family name British Railways Mark 1 and Mark 2A, 2B and 2C Constructed Mk1 1951–1963 XP64 1964 Mk2a 1968 Mk2b 1969 Mk2c 1969-70 Number built 2168 Fleet numbers Mk1 24000–25507, 25510–26217 XP64 25508-25509 Mk2a 19452-19473 Mk2b 19478-19513 Mk2c 19515-19560 Capacity Mk1 48 with armrests 64 without Mk2a/b/c 42 Operator British Rail Specifications Car length 64 ft 6 in (19.66 m) Width 9 ft 3 in (2.82 m) Height 12 ft 9+1⁄2 in (3.90 m) Doors Manual slam doors, three on each side Maximum speed BR1: 90 mph (145 km/h) B4/CW: 100 mph (161 km/h) Weight 32.5 to 36.5 long tons (33.0 to 37.1 t; 36.4 to 40.9 short tons) HVAC Steam or electric heat, or both Bogies BR1, Commonwealth or B4 Braking systems Vacuum, air, or both Coupling system Drop-head knuckle coupler on draw-hook (dual) Track gauge 4 ft 8+1⁄2 in (1,435 mm) standard gauge

The **Second Corridor** (previously **Third Corridor**) type of [railway carriage](/source/Passenger_car_(rail)) 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](/source/Corridor_(rail_vehicle)).

The [British Railways Mark 1](/source/British_Railways_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.[*[clarification needed](https://en.wikipedia.org/wiki/Wikipedia:Please_clarify)*]

In 1985, a number of [Mark 2](/source/British_Rail_Mark_2) [First Corridor](/source/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](/source/Multiple_unit) based on [Mark 1](/source/British_Rail_Mark_1) coaches have standard class compartments, such as [Class 438](/source/British_Rail_Class_438). Many SKs still operate on preserved UK railway lines.

Designations for second corridor carriages are as follows:

LNER Code Description LMS Code BSK Brake Second Corridor CH DMBSK Driving Motor Brake Second Corridor DMSK Driving Motor Second Corridor MBSK Motor Brake Second Corridor SK Second Corridor CF TBSK Trailer Brake Second Corridor TSK Trailer Second Corridor

## Livery

In 1951 the initial livery for Mk1 coaches on British Railways was crimson lake and cream with black and gold lining, and all new Mk1 SK coaches were delivered in this livery up until 1956. In 1956 the standard livery changed to maroon with black and gold lining, except for the Southern region stock which adopted an unlined dark malachite green. Western Region adopted chocolate and cream on sufficient stock to operate its named trains such as the [Cornish Riviera Express](/source/Cornish_Riviera_Express) and the [Torbay Express](/source/Torbay_Express). In 1965 Manastral Blue & Grey livery was introduced as trailed on XP64 stock the year before and was the network standard for over 20 years. In the 1980s the NSE livery of white with blue at window level and red stripe under was introduced for stock in the south east of England.

## Orders

Lot No. Diagram Mark Built Builder Qty Fleet numbers Notes 30002 146 1 1951 Derby 180 24000–24179 BR1 bogies 30015 146 1 1951-2 Doncaster 40 24180–24219 BR1 bogies 30026 146 1 1951-2 York 82 24220–24301 BR1 bogies 30020 146 1 1952 Ashford 24 24302–24331 BR1 bogies 30007 146 1 1953 BRCW 36 24332–24396 BR1 bogies 30030 146 1 1953 Derby 40 24397–24436 BR1 bogies 30072 146 1 1953 Wolverton 10 24437–24446 BR1 bogies 30088 146 1 1954 Swindon 22 24447–24468 BR1 bogies 30070 146 1 1954 York 36 24469–24538 BR1 bogies 30068 147 1 1952 York 30 24539–24548 BR1 bogies 30070 146 1 1952 York 8 24549-24556 BR1 bogies 30070 146 1 1954 York 12 24557–24568 BR1 bogies 30070 146 1 1954-55 York 7 24569-24575 BR1 bogies 30057 146 1 1953 BRCW 100 24576–24675 BR1 bogies 30058 146 1 1953 Cravens 25 24676–24700 BR1 bogies 30059 147 1 1953 Cravens 20 24701–24720 BR1 bogies 30073 146 1 1953 Wolverton 25 24721–24745 BR1 bogies 30077 147 1 1954 Swindon 8 24746–24753 BR1 bogies 30078 146 1 1954 Swindon 42 24754–24795 BR1 bogies 30137 146 1 1954 BRCW 23 24796–24818 BR1 bogies 30153 146 1 1955-56 Derby 126 24819–24944 BR1 bogies 30154 146 1 1956 Derby 30 24945–24974 BR1 bogies 30208 146 1 1956 Derby 70 24975–25044 BR1 bogies 30155 147 1 1955-56 Wolverton 120 25045–25164 BR1 bogies 30230 147 1 1957 Metro Cammell 83 25165–25247 BR1 bogies 30231 146 1 1957-58 Metro Cammell 32 25248–25279 BR1 bogies 30494 150 1 1958 Metro Cammell 3 25280–25282 BR1 bogies 30349 146 1 1957 Wolverton 120 25283–25402 BR1 bogies 30350 146 1 1957 Wolverton 22 25403–25454 BR1 bogies 30356 148 1 1957 Metro Cammell 1 25455 BR1 bogies 30358 149 1 1957 GRCW 1 25456 BR1 bogies 30371 151 1 1957 Doncaster 1 25457 BR1 bogies 30374 146 1 1957 York 50 25458-25507 BR1 bogies 30737 152 XP64 1964 Derby 2 25508-25509 B4 bogies 30426 146 1 1957-58 Wolverton 146 25558-25703 BR1 bogies 30685 146 1 1961-62 Derby 202 25704-25905 CW bogies 30685 146 1 1962 Derby 67 25906-25972 BR1 bogies 30719 146 1 1962 Derby 87 25973-26059 CW bogies 30720 147 1 1962-63 Derby 78 26060-26137 CW bogies 30726 146 1 1962-63 York 80 26138-26217 CW bogies

## Conversions

- In 1973-74 4 **Second Corridor** were converted to [Class 309](/source/British_Rail_Class_309) **TSK** later become **TSOL**

- In 1976, 9 **Second Corridor** were converted to **Stowage Vans** 80431-80439 **POT**

- In 1977, 15 **Second Corridor** were converted to **Sorting Vans** 80381-80395 **POS**.

SK TSK Diagram 26024 71110 469 Class 309 26189 71108 469 Class 309 26196 71109 469 Class 309 26203 71107 469 Class 309

SK Type Year Diagram 25033 POS 80383 1977 726A/NS531 25045 POS 80387 1977 726A/NT531 25047 POS 80390 1977 726A/NT531 25056 POS 80395 1977 726A/NT531 25068 POT 80437 1976 727A/NT521 25071 POT 80432 1976 727A/NS521 25077 POT 80436 1976 727A/NS521 25078 POS 80384 1977 726A/NS531 25082 POS 80392 1977 726A/NS531 25083 POS 80385 1977 726A/NS531 25088 POS 80388 1977 726A/NS531 25089 POS 80391 1977 726A/NS531 25099 POS 80386 1977 726A/NS531 25103 POS 80389 1977 726A/NS531 25104 POT 80431 1976 727A/NS521 25109 POS 80382 1977 726A/NS531 25112 POS 80381 1977 726A/NS531 25117 POT 80435 1976 727A/NT521 25119 POS 80393 1977 726A/NT531 25127 POT 80439 1976 726A/NT521 25434 POT 80434 1976 726A/NT521 25139 POT 80438 1976 727A/NT521 25150 POT 80433 1976 727A/NT521 25156 POS 80394 1977 726A/NT531

### Departmental use

Mk1 SK Departmental Notes 24011 DB975415 Match wagon for ballast cleaner 24026 ADB977057 Doncester works test train 24035 ADB975439 Crewe works test train 24062 LDB975062 CM&EE Electrification staff coach 24067 LDB975064 CM&EE Electrification staff coach 24070 ADB975161 BTU tool van 24085 TDB977187 Train crew training coach 24119 ZDB975074 Exhibition coach 24134 LDB975065 CM&EE Electrification staff coach 24140 LDB975066 CM&EE Electrification staff coach 24147 ZDB975073 Exhibition coach 24154 ADB975263 Overhead Line Maintenance Stores coach 24157 ADB975162 BUT Tool & Generator coach 24168 LDB975067 CM&EE Electrification staff coach 24189 LDB975068 CM&EE Electrification staff coach 24274 ADB975801 CCE staff & dormitory coach for ballast cleaner 24308 DB975392 Match wagon for ballast cleaner DR76216 24320 LDB975069 CM&EE Electrification staff coach 24345 ADB975806 CCE staff coach 24410 LDB975070 CM&EE Electrification staff coach 24420 KDB975114 S&T cable flat 24428 ADB977058 Doncester works test train 24429 ADB975904 Overhead Line Maintenance cable flat 24430 TDB977188 Train crew training coach 24457 ADB975799 CCE staff & dormitory coach for ballast cleaner 24485 DB975412 Match wagon for ballast cleaner 24516 TDB977189 Train crew training coach 24531 ADB975726 Overhead Line Maintenance generator & stores coach 24579 ADB977090 CCE staff coach 24589 ADB975546 Overhead Line Maintenance cable flat 24647 TDB975135 Lecture coach 24677 TDB977247 MOD special instruction coach 24679 TDB977248 MOD special instruction coach 24685 TDB977422 Special instruction coach 24745 KDB975106 S&T cable flat 24752 ADB975440 Crewe works test train 24766 ADB975732 Overhead Line Maintenance stores & roof access coach 24796 ADB975802 CCE staff & dormitory coach for ballast cleaner 24815 ADB975803 CCE staff & dormitory coach for ballast cleaner 24841 TDB977497 Special instruction coach 24849 ADB975925 Overhead Line Maintenance cable flat 24857 TDB977498 Special instruction coach 24858 ADB977059 Doncester works test train 24870 ADB975441 Crewe works test train 24890 TDB977430 Special instruction coach 24899 CDB977103 EMU barrier coach 24936 ADB975442 Crewe works test train 24972 ADB975805 CCE staff & dormitory coach for single line gantries 24976 DB975828 Underframes used for CCE staff & dormitory portakabin 24982 DB975379 CCE staff & dormitory coach 24990 ADB975926 Overhead Line Maintenance cable flat 24994 ADB975915 Overhead Line Maintenance cable flat 25003 ADB975913 Overhead Line Maintenance cable flat 25017 ADB975742 Overhead Line Maintenance office & staff coach 25025 ADB975920 Overhead Line Maintenance cable flat 25026 ADB975922 Overhead Line Maintenance cable flat 25038 ADB977320 Crewe works diesel loco test train coach 25069 ADB975924 Overhead Line Maintenance cable flat 25079 ADB975080 BTU tool van 25094 ADB975908 Overhead Line Maintenance cable flat 25105 ADB975905 Overhead Line Maintenance cable flat 25106 18106 ADB977322 Crewe works diesel loco test train coach 25122 ADB975443 Crewe works test train 25132 ADB975797 CCE staff & dormitory coach for ballast cleaner 25161 ADB975906 Overhead Line Maintenance cable flat 25171 TDB977195 MOD special instruction coach 25190 ADB975736 Overhead Line Maintenance stores & roof access coach 25196 ADB975927 Overhead Line Maintenance cable flat 25205 ADB975930 Overhead Line Maintenance cable flat 25222 ADB975622 EMU Barrier coach 25226 ADB975722 Overhead Line Maintenance generator & stores coach 25236 CDB977102 EMU barrier coach 25238 ADB975923 Overhead Line Maintenance cable flat 25243 ADB975946 Overhead Line Maintenance cable flat 25262 ADB975712 Overhead Line Maintenance stores coach 25281 DB975816 Underframes used for CCE staff & dormitory portakabin 25286 18286 TDB977496 Special instruction coach 25302 ADB975771 Overhead Line Maintenance office & staff coach 25318 18318 ADB977323 Crewe works diesel loco test train coach 25326 ADB977319 Crewe works diesel loco test train coach 25329 DB975829 Underframes used for CCE staff & dormitory portakabin 25338 TDB977173 Train crew training coach 25339 ADB977151 Crewe work test tain 25340 ADB975903 Overhead Line Maintenance cable flat 25343 ADB975798 CCE staff & dormitory coach for ballast cleaner 25353 ADB975763 Overhead Line Maintenance generator & stores coach 25356 18356 ADB977321 Crewe works diesel loco test train coach 25358 ADB975743 Overhead Line Maintenance office & staff coach 25388 ADB975723 Overhead Line Maintenance generator & stores coach 25396 TDB977174 Train crew training coach 25407 18407 TDB977407 MOD special instruction coach 25412 18412 TDB977584 Special instruction coach 25420 ADB975713 Overhead Line Maintenance stores coach 25422 18422 TDB977499 Special instruction coach 25429 DB975817 Underframes used for CCE staff & dormitory portakabin 25430 ADB975758 Overhead Line Maintenance stores coach 25434 ADB975711 Overhead Line Maintenance stores coach 25437 ADB975762 Overhead Line Maintenance generator & stores coach 25440 ADB975744 Overhead Line Maintenance office & staff coach 25461 ADB975767 Overhead Line Maintenance stores & roof access coach 25466 ADB975714 Overhead Line Maintenance stores coach 25477 ADB975766 Overhead Line Maintenance stores & roof access coach 25479 ADB975738 Overhead Line Maintenance stores & roof access coach 25480 DB975825 Underframes used for CCE staff & dormitory portakabin 25493 DB975822 Underframes used for CCE staff & dormitory portakabin 25494 TDB977237 MOD special instruction coach 25495 ADB975759 Overhead Line Maintenance stores coach 25497 DB975830 Underframes used for CCE staff & dormitory portakabin 25498 ADB975947 Overhead Line Maintenance cable flat 25507 ADB975800 CCE staff & dormitory coach for ballast cleaner 25567 TDB977129 MOD Special instruction coaches 25570 18570 TDB977408 MOD spechal instruction coach 25600 ADB975721 Overhead Line Maintenance generator & stores coach 25602 18602 DB977724 CE staff & tool coach 25623 CDB977100 EMU barrier coach 25664 ADB975741 Overhead Line Maintenance office & staff coach 25666 ADB975444 Crewe works test train 25667 DB975824 Underframes used for CCE staff & dormitory portakabin 25669 DB975821 Underframes used for CCE staff & dormitory portakabin 25695 ADB975734 Overhead Line Maintenance stores & roof access coach 25696 ADB975804 CCE staff & dormitory coach for ballast cleaner 25699 DB975823 Underframes used for CCE staff & dormitory portakabin 25729 18729 ADB977982 Brake Force Runner 25735 18735 TDB977653 Special instruction coach 25755 18755 TDB977419 Special instruction coach 25764 ADB975731 Overhead Line Maintenance stores & roof access coach 25807 18807 TDB977420 Special instruction coach 25811 18811 TDB977514 Driver training coach 25831 18831 TDB977458 Driver training coach 25840 18840 TDB977459 Driver training coach 25846 18846 TDB977515 Driver training coach 25852 18852 TDB977429 Special instruction coach 25859 18859 TDB977428 Special instruction coach 25860 18860 TDB977516 Driver training coach 25878 18878 TDB977517 Driver training coach 25884 18884 TDB977460 Driver training coach 25885 18885 TDB977461 Driver training coach 25953 ADB975866 EMU barrier coach 25973 18973 TDB977462 Driver training coach 25985 18985 TDB977463 Driver training coach 26002 19002 TDB977464 Driver training coach 26010 19010 TDB977465 Driver training coach 26020 19020 TDB977512 Driver training coach Mk2a FK SK Departmental Notes 13458 19458 RDB977914 Test Train coach 13462 19465 6352 Mk4 Barrier coach 13466 19466 TDB977662 MOD Special instruction coach Mk2b FK SK Departmental Notes 13476 19476 RDB977525 Brake force runner 13478 19478 6353 Mk4 Barrier coach 13481 19481 RDB977530 Brake force runner 13484 19484 RDB977528 Brake force runner 13485 19485 TDB977663 MOD Special instruction coach 13487 19487 RDB977529 Brake force runner 13491 19491 TDB977661 MOD Special instruction coach 13501 19501 TDB977656 MOD Special instruction coach 13505 19505 TDB977654 MOD Special instruction coach 13511 19511 TDB977660 MOD Special instruction coach Mk2c FK SK Departmental Notes 13518 19518 TDB977659 MOD Special instruction coach 13531 19531 TDB977658 MOD Special instruction coach 13557 19557 TDB977655 MOD Special instruction coach

## Corridor Brake Standard/Second

A second corridor coach with a guard's brake compartment is designated BSK. The Mark 1 BSKs had 4 compartments, built as two variants with or without arm-rests depending on region, as with the SKs.

## See also

- [Corridor coach](/source/Corridor_coach)

## References

- Keith Parkin *Locomotive Hauled Mark 1 Coaching Stock of British Railways* The Historical Model Railway Society, [ISBN](/source/ISBN_(identifier)) [9780902835061](https://en.wikipedia.org/wiki/Special:BookSources/9780902835061)

- British Railways Vehicle Diagram Book 200 for Loco Hauld Coaches [http://www.barrowmoremrg.co.uk/BRBDocuments/CS/Book_No_200_EK_web.pdf](http://www.barrowmoremrg.co.uk/BRBDocuments/CS/Book_No_200_EK_web.pdf)

- Michael Harris *British Rail Mark 2 Coaches - the design that launched InterCity* [Venture Publications](http://www.mdsbooks.co.uk/detail.html?this=aaVPL48)[*[permanent dead link](https://en.wikipedia.org/wiki/Wikipedia:Link_rot)*] [ISBN](/source/ISBN_(identifier)) [978-1-898432-48-7](https://en.wikipedia.org/wiki/Special:BookSources/978-1-898432-48-7)

- Ashley Butlin *British Rail Coaching Fleet Mk2, Mk3 & Mk4* A British Railways Illustrated Modern Times Series, Irwell Press [ISBN](/source/ISBN_(identifier)) [1-871608-87-2](https://en.wikipedia.org/wiki/Special:BookSources/1-871608-87-2)

- G.M.Kichenside *British Railways Coaches 1958* Ian Allan ABC

- P Mallaband & L J Bowles *Coaching Stock of British Railways 1976* Railway Correspondence and Travel Society

- P Mallaband & L J Bowles *Coaching Stock of British Railways 1978* Railway Correspondence and Travel Society, [ISBN](/source/ISBN_(identifier)) [9780901115447](https://en.wikipedia.org/wiki/Special:BookSources/9780901115447)

- P Mallaband & L J Bowles *Coaching Stock of British Railways 1982* Railway Correspondence and Travel Society

- Departmental Coaching Stock DB97xxxx series 1983 Edition, Lineside Publications

- Peter Fox *Departmental Coaching Stock First Edition 1984* Platform 5 Publications, [ISBN](/source/ISBN_(identifier)) [9780906579473](https://en.wikipedia.org/wiki/Special:BookSources/9780906579473)

- Roger Butcher & Peter Fox *Departmental Coaching Stock Second Edition 1985* Platform 5 Publications, [ISBN](/source/ISBN_(identifier)) [9780906579473](https://en.wikipedia.org/wiki/Special:BookSources/9780906579473)

- Roger Butcher & Peter Fox *Departmental Coaching Stock Third Edition 1987* Platform 5 Publications, [ISBN](/source/ISBN_(identifier)) [9780906579701](https://en.wikipedia.org/wiki/Special:BookSources/9780906579701)

- Roger Butcher, Peter Fox & Peter Hall *Departmental Coaching Stock Fourth Edition 1990* Platform 5 Publications, [ISBN](/source/ISBN_(identifier)) [9780906579978](https://en.wikipedia.org/wiki/Special:BookSources/9780906579978)

- Roger Butcher *Departmental Coaching Stock Fifth Edition 1993* SCT Publications, [ISBN](/source/ISBN_(identifier)) [9781872768106](https://en.wikipedia.org/wiki/Special:BookSources/9781872768106)

v t e Carriage stock of British Rail Passenger carriages Mark 1 BCK BFK BSK BSO BSOT CK FK FO RB RBR RF RKB RMB RU SK SLC SLEP SLF SLSTP SO TSO CL BS S SO - (Suburban non-corridor) 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 SLED SLEP TSO TSOB - (Locomotive-hauled) Mark 4 FO RFB RSB TSO TSOD TSOE - (InterCity 225 trailers) Mark 5 (I) FO RFB RSB TSO TSOD TSOE - (InterCity 250 trailers) Mark 5 (II) FO RLO SLE SLED SLEP TGS TSO TSOD - (Locomotive-hauled) Mark 5A DT FO TSO TSOD - (Locomotive-hauled) Non-passenger carrying carriage stock (NPCCS) Mark 1 BG BPOT BV Courier CCT GUV PCV POS POT TCV Mark 3, Mark 4 & Mark 5 (I) DVT British Rail coach type codes British carriage and wagon numbering and classification

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Adapted from the Wikipedia article [Standard Corridor](https://en.wikipedia.org/wiki/Standard_Corridor) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Standard_Corridor?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.