[2] Classes 371 and 381 were intended as the so-called "Universal Networker", a dual voltage train capable of operating using both 25 kV AC from overhead wire and 750 V DC from third rail.

The publicity sheet promised air conditioning, trolley catering, telephone area, carpeting throughout, customer operated power doors, individual reading lights in first class, high backed seats for comfort, public address system and dot matrix on board information system.

A mock-up was unveiled in August 1991, baring a resemblance to the Class 442 "Wessex Express" units operating to the South-West, but with sliding doors.

[4] The Class 319 were the primary dual voltage commuter unit operating over the Thameslink route for nearly 30 years, but have been replaced by Class 700, part of the Siemens Desiro City family.

The Class 365 fleet was used on the Great Northern routes, however was scrapped in the early 2020s.