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DVT at Leeds station]] A Driving Van Trailer or '''DVT''' is a purpose-built railway vehicle that allows the driver to operate a Locomotive from the other end of a train. Trains operating with a DVT therefore do not require the locomotive to run round to the opposite end of the train. DVTs and locomotives operate in Push-pull formation utilising a ''' Time-Division Multiplexer ''' to send control signals along the "RCH" jumper cables that run the length of the train. This allows the same cables to be used for lighting and the public address system, as well as driver-guard signalling. In addition to the driver's cab, the DVT has luggage space and a guard's office. When a train is operated by a DVT, the control signals are encoded and multiplexed onto the cables by the TDM equipment in the DVT. At the locomotive, these signals are demultiplexed by the TDM equipment, and the signals are used to control the locomotive. For safety reasons, the Air Braking system is operated directly from whichever cab the driver is driving from. If the TDM fails and cannot be reconfigured, the train may still operate, but if the DVT is leading, it will be necessary to uncouple the locomotive and attach it to the front of the train. The British DVT was developed from the DBSO , but unlike its predecessor, it was built specifically for this purpose. The original DVTs were designed to be used with British Rail Mk 3 Coaches , and the second design with British Rail Mk 4 Coaches , which have a narrower profile. This enables it to be converted to Tilting Operation if required in the future. DVTs can be seen in service with GNER , Virgin Trains and 'one' Anglia . Locomotive classes which have been used to provide the power include classes 67 , 86 , 87 , 89 , 90 , and 91 . |
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