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The prototype Mark 2 carriage (a First Corridor-type coach, number 13252) was built in 1963, and is now preserved at the National Railway Museum, York. The production runs, of which there were seven sub-divisions identified (Mark 2 and Mark 2A to Mark 2F), their build dates and their specific differences are set out in the table below:
| Mark | Built | Features |
|---|---|---|
| Mark 2 | 1964-66 | The basic Mark 2 model, with pressure ventilation and wood panelling |
| Mark 2A | 1967-68 | Improvement of Mark 2, with adoption of more features from the XP64 set |
| Mark 2B | 1969 | Longer body, centre door omitted and wide wrap-round doors fitted at the ends |
| Mark 2C | 1969-70 | Lower ceiling with ducts for air conditioning, but not actually fitted |
| Mark 2D | 1971-72 | Air conditioning fitted, so no opening windows in the seating area |
| Mark 2E | 1972-74 | Luggage racks fitted opposite toilet cubicles, which were reduced in size |
| Mark 2F | 1973-75 | Interior panelling made of plastic and new style seating |
| 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 |