class-421-4cig
The BR Class 421 '4CIG' was a family of 104 four-car DC electric multiple unit sets built by British Railways York Works between 1964 and 1972 for the Southern Region's main-line and longer-distance express services on the third-rail network, serving the Brighton Main Line, the Coastway routes, and the Portsmouth Direct Line as the successor to the 4CEP on the SR's busiest non-suburban electric services. The CIG designation stood for Corridor, Interconnecting, Guard's van, reflecting the open-plan interior with inter-vehicle gangway connections that gave passengers more freedom of movement than the older compartment-stock 4CEP units.
The 4CIG represented an important modernisation of Southern Region EMU design, incorporating the open saloon interior philosophy that was replacing compartment stock across BR, and giving SR passengers on the Brighton, Eastbourne, Portsmouth, and Coastway services a more modern and flexible interior suited to a wider range of journey types and passenger loads. The 4CIG worked in multiple with 4BIG buffet car units on the longer Brighton Main Line services, where the buffet provision was an important commercial feature of the service.
Two examples are preserved: 1392 and 1498.
Design and development
BR York built the 4CIG 1964–72 as the SR's modern open-plan express EMU for Brighton, Coastway, and Portsmouth services, replacing the older compartment-stock CEP on the busiest SR express electric routes. 104 sets; worked in multiple with 4BIG buffet units on Brighton line. Two preserved.
Service and withdrawals
4CIG worked SR and Network SouthEast main-line electric services from 1964. Withdrawn 2005–2019. Two preserved.
Identification features
Four-car 750 V DC third-rail EMU.
Notable locomotives
- Several preserved on Southern heritage railways
