The British Rail Class 332 electric multiple unit passenger trains were built between 1997 and 1998 by CAF, with traction equipment supplied by Siemens Transportation Systems.

Following BAA being granted rights to operate services from London Paddington to Heathrow Airport, 14 trains were ordered in July 1994 from Siemens Transportation Systems.

A derogation was issued in 2001, which exempted the class from mandatory TPWS installation, due to the fitment of the ATP.

[15] Following withdrawal of the units, the depot was demolished as part of the construction of High Speed 2 and Old Oak Common station.

[21][22][23] On 29 February 2016, the entire class was withdrawn after a structural defect was found on the underside of a driving car of unit number 332014.