BR Class 117

The British Rail Class 117 diesel multiple units (DMUs) were built by Pressed Steel from 1959 to 1961. When first introduced, these three-car units were all based with the similar Class 121 single carriage (railcar) units on British Railway's Western Region for suburban work out of London Paddington and Cornwall. The units were largely based at Southall, and Plymouth Laira depots. The units remained here for many years working these services.