The British Rail Class 421 (or 4Cig) electrical multiple units were built at BR York Works between 1964 and 1972. Units were built in two batches and were initially introduced on services on the Brighton Main Line. Later units were introduced on services to Portsmouth. These units replaced older Southern Railway-designed units such as the 5Bel Brighton Belle units and 4Cor units.
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number built
28, 166
operator
British Rail, Network SouthEast, Southern (train operating company), South West Trains, Connex South Central, Connex South Eastern, South Eastern Trains
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