page_title: List of British Rail electric multiple unit classes
section_title: Second generation
hierarchical_section_title: List of British Rail electric multiple unit classes / AC EMUs and dual-voltage EMUs / Second generation
caption_attribution_description: English: BR Class 312, nos. 312718 and 312721 at Kirby Cross on 6th March 2004 Image by Phil Scott (Our Phellap)
context_page_description: This page lists every electric-powered multiple unit allocated a TOPS classification or used on the mainline network since 1948. British Rail operated a wide variety of electric multiple units for use on electrified lines.
  AC units operate off 25 kV alternating current from overhead wires. Where clearances for the overhead wires on the Great Eastern Main Line and London, Tilbury and Southend railway routes were below standard, a reduced voltage of 6.25 kV AC was used. The Midland Railway units used 6.6 kV AC. Under the computer numbering, AC units were given a class in the range 300-399.
  DC units operate off 650-850 V direct current from a third rail on the Southern Region and North London, Merseyside and Tyneside networks. The Manchester-Bury Railway line used 1,200 V DC from a side-contact third rail. The Manchester South Junction & Altrincham and "Woodhead" and initially the Great Eastern Railway routes used 1,500 V DC from overhead wires. Under the computer numbering, DC units were given a class in the range 400-599.
caption: First Great Eastern Class 312 units nos. 312718 and 312721 at Kirby Cross railway station.
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