|Type||TOPS||Seating (all 2nd class)||Weight||Lot no.||Diagram|
|51591-51650||DMBS||127||78 / 76 seats||40 tons||30521||BR 588|
|59589-59618||TSL||186||90 / 86 seats||30 tons||30522||BR 589|
|59619-59648||TS||186||106 / 98 seats||29 tons||30523||BR 590|
The DMBS was altered to give through access between the saloons reducing the seating by two. The TSL seats were reduced by four when the vehicles were gangwayed, they already had through access within the vehicle for access to the lavatories. The TS seating was reduced by eight when gangwayed as access between saloons was also required.
Despite their differences the TS & TSL vehicles were both given TOPS Class 186. The pratically identical Class 115 TS vehicles were given Class 173.