A short lived classification system called the DMBS cars "Type A1" and the DTCL cars "Type B2"
| Number | Type | Seating | Weight | Lot no. | Diagram |
|
50415 - 50419 |
DMBS | 59 2nd (2+3) | 27 tons | 30288 | 606 |
| 56170-56174 | DTCL | 16 1st (2+2) & 50 2nd (2+3) | 22 tons 10cwt | 30289 | 607 |
They were withdrawn before TOPS classification was applied, but were allocated Class 109 and the DTCLs would have been Class 146.
Throughout their BR days, the sets retained their original partners.