Southern Railway multiple unit numbering and classification: Difference between revisions
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The early AC electric multiple units were referred to by a two-letter code. This was adapted for the DC third-rail system that was adopted by the Southern Railway, with units being given a three-letter code (sometimes two letters) prefixed by the number of cars in each unit, e.g. 4SUB for a 4-car suburban unit.
The Southern Region perpetuated this, and the same principles were adopted for diesel-electric multiple units but with single-letter codes. The last new type to be officially allocated a designation in this series was the PEP stock of the early 1970s. Some types built since have been given semi-official designations in this style.
''This is different from the system used by British Rail (adopted from the LNER) to indicate the type of non-powered coach — see [[British Rail coach designations]].''
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