These diesel multiple units were introduced to Scotland from 1960. They were originally allocated to Hamilton depot. They initially worked services on the south side of Glasgow. This included the Glasgow St Enoch to East Kilbride, Kilmacolm, Hamilton Circle, Largs and Ardrossan services. Later, after the closure of St Enoch in 1966, they were deployed between Glasgow Central and Edinburgh via Shotts. They were known as the Derby Heavyweights as they had heavy bodywork and later classified as the Class 107. After Hamilton Depot closed in 1982 they transferred to Ayr depot. Later on they went to Eastfield and Haymarket depots. Most were withdrawn from traffic by 1991. Some were converted to Sandite units but were all gone by 1994. In the early years, some worked charters onto the West Highland Lines. This book covers the class from their introduction in 1960 until their withdrawal from British Rail in 1991. Various sets made into preservation including the Speyside Railway at Aviemore and the Fife Heritage Railway.
