Description
Two batches of units were built for different subdivisions of Network SouthEast to replace elderly "Heritage" DMUs as well as locomotive-hauled trains on services out of London Paddington and London Marylebone. The fleet is wide-bodied to take advantage of the gauges of the former Great Western Railway and Great Central Railway on whose lines it runs. As a result, it is restricted to these routes.
Both have a 350 horsepower (261 kW) Perkins 2006-TWH diesel engine on each car, Voith Turbo-transmissions, and Gmeinder final drive.
When new, the units were branded as either Chiltern Turbo or Thames Turbo between the two first class windows of the DMCL carriage.
Class 165 units were some of the first trains in Britain to be designed for Driver Only Operation- in cases where a Guard is required, the Guard must carry out their door operation duties via a bell system to signal the Drivers to close doors and start the train. This requires the Guard to return to a vacant cab at each station to carry out these duties. Examples of this include Chiltern Railways services north of Banbury or First Great Western services on the Cotswolds Line.
Read more about this topic: British Rail Class 165
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