The British Rail Class 442 (5-WES) Wessex Electrics were electric multiple unit passenger trains introduced in 1988 by Network SouthEast on the South West Main Line from London Waterloo to Weymouth to coincide with the electrification of the line from Bournemouth. Twenty-four five-car units were built by British Rail Engineering Limited's Derby Litchurch Lane Works.

The class holds the world speed record for a third-rail train, having attained 109 mph (175 km/h) on a test run prior to entering service.

In 2016 a driving car from 442401 was nominated for the National Collection. After the National Railway Museum declined to take the nominated carriage, 77382, it was placed in the custody of Northumbria Rail, Bedlington.