The original TOPS classification for the DTS vehicles was Class 149.
|Type||Seats||Lot No.||Diagram No.||Weight|
|55020 - 55035||DMBS||65 2nd||30518||512||37t 8cwt|
|56280 - 56289||DTS||93 2nd||30519||513||29t 7cwt|
|89 2nd (gangwayed)||513A (gangwayed)|
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 renumbered to 54280-9 circa 1983.
Three vehicles were named while in the care of Silverlink, the names previously were carried on withdrawn Class 117 vehicles:
55027 - Bletchley TMD
55029 - Marston Vale
55031 - Leslie Crabbe