|Type||TOPS||Weight||Lot No.||Diagram||Seats (2nd Class)|
|55000 - 55019||DMBS||122||36 tons||30419||539||65 (2+3)|
|56291 - 56299||DTS||150||29 tons||30420||538||95 (2+3) - later reduced to 91|
|538A||89 when gangwayed|
The DTS seats were first reduced from 95 to 91 when through access was provided inside the vehicle.
Only the DTS vehicles were gangwayed, they couldn't use the gangway working with a bubble car but could be used with other classes.
The DTS vehicles were first designated as Class 150s when the class numbering system was introduced, but later just became Class 122s. The parcels conversions were initially identified as Class 131s.