Standard BR Type 1 loco, 228 locos built at Vulcan Foundry and Robert Stephenson and Hawthorns between 1957 and 1968. Single ended locos, mainly used in pairs. Most now scrapped, some still in use with smaller freight companies. Originally numbered D8000 to D8199 and D8300 to D8327. Subsequently renumbered into the TIOPS series as 20001 to 20228. There were two different renumberings into the class 20/3 series, the first in 1986 for a short while incorporating locos on Peak Forest workings. The second series was for DRS operated locos from 1996. Renumberings for class 20/9 locos was for those operated by Hunslet-Barclay on weedkilling trains, subsequently sold on to other operators.