Electric Multiple Units
The numbering and classification of electric multiple unit stock on the London Underground is usually related to the type of line that the trains are used on. There are two distinct types of line: 'Sub-surface' lines (earlier lines built on the cut-and-cover method, which use trains of similar size to those on the national railway network), and 'Tube' lines (deep-level lines, built to a more restricted size). The 'Sub-surface' lines are the Circle, District, East London, Hammersmith & City and Metropolitan lines; all the other lines are 'Tube' lines.
Read more about this topic: London Underground Rolling Stock Numbering And Classification
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