[2] Subsequent units were introduced onto services in West Cumbria, Lincolnshire, Norfolk, Newcastle to Middlesbrough, Edinburgh to Glasgow[3] and, later, Birmingham to Sutton Coldfield, Bletchley to Buckingham and Banbury, and East London lines services.

These units were extremely successful, helping to reduce the operating costs of branchlines and also attracting many more passengers when new.

They carried 800,000 more passengers on the London Midland Region between February and October 1956 than steam did in the same period of 1955.

[4] Due to their success, British Railways ordered many more DMU vehicles from various builders over the next decade, thus helping to eliminate steam locomotives.

Four different sorts of formation were created from the 217 cars built of this type, as follows: 79683 was left over as a spare DTCL, and took the place of 79649 in 1957, when this was converted into a special saloon on diagram 565.