page_title: British Rail Class 421
section_title: Vehicle numbering
hierarchical_section_title: British Rail Class 421 / Vehicle numbering
caption_attribution_description: This image was copied from en.wikipedia.org (en:Image:1908 at London Victoria.JPG). The original description was: BR Class 421/6, no. 1908, at en:London Victoria on 15th August 2004. This unit was one of eight modified 'Phase 1' unit fitted with Mk.6 motor bogies. It was also one of only four 'Phase 1' units to be repainted in South Central livery. It was withdrawn in October 2004 and has since been scrapped.
context_page_description: The British Rail Class 421 electrical multiple units were built at BR's Holgate Road carriage 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. Towards the end of their life, with the increasing use of newer trains which were equipped with sliding or plug doors, these trains were known commonly as "slam-door trains". The fleet's lifespan was 46 years.
context_section_description: The numbering of individual vehicles and details of when units were built are shown in the table below.
caption: Class 421/6 no. 1908 at London Victoria on 15 August 2004. This unit was one of eight modified 'Phase 1' unit fitted with Mk.6 motor bogies. It was also one of only four 'Phase 1' units to be repainted in South Central livery. It was withdrawn in October 2004 and has since been scrapped.
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