Class 20

Builder: English Electric at Vulcan Foundry and Robert Stephenson and Hawthorns

Power: Diesel-electric

Built: 1957–1962, 1965–1968

Number in class: 228

Withdrawn: 1976–present

Numbers: D8000–D8199, D8300–D8327; later 20001–20228, 20301-20315, 20901-20906