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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). Their numbers were amended by the simple expedient of changing them from 13xxx to 19xxx, since that put them after the end of the 'Mark 1' range (numbers were in the 19452-19557 range).
No carriages of this type are still in daily use on the mainline network, since open saloon carriages are now preferred by operating companies. However, some still operate in charter trains, and they remain popular on preserved railway lines.
| Mark 1 - Mark 2 - Mark 3 - Mark 4 | |
| Passenger Coaches | |
| Mark 1: | FK - SK |
| Mark 2: | DBSO - FK - SK |
| Non-Passenger Coaches | |
| Mark 3 & 4: | DVT |