On most lines, the end cars of units are described as 'A' end cars or 'D' end cars ('B' end until the 1930s). Motor Shunting car (as NDM, but with provision to split from the adjacent MS as required in depots)Ĭontrol (or 'Driving') Trailer car (with a driving cab, but no motors) Uncoupling Non- Driving Motor car (as NDM, but with controls at one end to permit uncoupling and shunting, but not full driving facilities) ![]() Non- Driving Motor car (motored, but with no driving cab) The different types of car used to make up electric multiple units are referred to by a series of codes, described below:ĭriving Motor car (with motors and a driving cab) In addition, some units have no driving cabs, and thus must always be included in the middle of a formation of units. Units are 'single-ended', where there is a driving cab at one end only, or 'double-ended', where there is a driving cab at both ends. On most lines, trains are formed from a pairing or triplet of units. The next sub-surface types were built for the Circle and District lines, and the opportunity was taken to allocate C (for the Circle line) and D (for the District line) respectively, omitting B. By 1960, most letters had been allocated, and the decision was taken to re-issue A (for the Amersham electrification) to the new Metropolitan stock. When the LPTB was formed, the ex-Metropolitan Railway units were incorporated into this series (types MV, MW, T, V, VT and W). This system was commenced by the DR for its stock. Sub-surface Stock is classified by a letter, usually issued sequentially, and which is sometimes followed by the last two digits of the year of delivery, e.g. They replaced the UERL's original Gate Stock (itself known as Standard Stock before the introduction of the then-new Pre-1938 tube stock), introduced for the opening of the Bakerloo, Piccadilly and Hampstead (Northern) lines and the replacement of the City & South London Railway's locomotive and carriage sets, the Watford Joint Stock of the Bakerloo, the Great Northern & City Railway's surface gauge stock, and the CLR's Tunnel Stock and Ealing Stock (which in turn comprised DMs of 19 vintage constructed to replace locos hauling trailers of 1900 vintage). The large number of broadly similar Tube trains built for the UERL during 1922-1934 were called (and are commonly still referred to as) Standard Stock (officially re-christened Pre-1938 tube stock upon rehabilitation), although there were many detail differences. This system was inaugurated by the London Passenger Transport Board (LPTB) with the 1935 Stock. Tube Stock is classified by the anticipated year of delivery at the time of ordering. The method of classification depends on the type of line the train operates on: Outside of the central area, both types of trains run on the surface. These are the Bakerloo, Central, Jubilee, Northern, Piccadilly, Victoria and Waterloo & City lines. Tube lines are deep-level lines, built to a more restricted loading gauge using circular tunnelling shields or tunnel boring machines. These are the Circle, District, Hammersmith & City, Metropolitan (and formerly East London) lines. Sub-surface lines were built using the cut-and-cover tunnelling method and use trains of similar size to those on the National Rail network. 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 in the central area of the network. For information about individual classes of locomotives and other rolling stock, see London Underground rolling stock. This page explains the principal systems for the rolling stock of the Central London Railway (CLR), the Underground Electric Railways Company of London (UERL), the District Railway (DR) and the Metropolitan Railway (MR). Rolling stock used on the London Underground and its constituent companies has been classified using a number of schemes.
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