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((inline|date=April 2019))
((refimprove|date=April 2019))
((Use dmy dates|date=March 2017))
((Use British English|date=March 2017))
[[Rolling stock]] used on the [[London Underground]] and its constituent companies has been classified using a number of schemes. 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). For information about individual classes of locomotives and other rolling stock, see [[London Underground rolling stock]].

==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 in the central area of the network.

Sub-surface lines were built using the [[Tunnel#Cut-and-cover|cut-and-cover]] tunnelling method and use trains of similar size to those on the [[National Rail]] network. These are the [[Circle line (London Underground)|Circle]], [[District line|District]], [[Hammersmith & City line|Hammersmith & City]], [[Metropolitan line|Metropolitan]] (and formerly [[East London line|East London]]) lines.

Tube lines are deep-level lines, built to a more restricted [[loading gauge]] using circular [[tunnelling shield]]s or [[tunnel boring machine]]s. These are the [[Bakerloo line|Bakerloo]], [[Central line (London Underground)|Central]], [[Jubilee line|Jubilee]], [[Northern line|Northern]], [[Piccadilly line|Piccadilly]], [[Victoria line|Victoria]] and [[Waterloo & City line|Waterloo & City]] lines. Outside of the central area, both types of trains run on the surface.((efn|In a number of cases, trains designed for tube lines run on surface routes originally built to mainline standards or for sub-surface trains:
* Central line west of [[White City tube station|White City]] runs on tracks built by the [[Great Western Railway]], and north of [[Stratford station|Stratford]] by the [[Great Eastern Railway]];
* Jubilee line north of [[Finchley Road tube station|Finchley Road]] runs on tracks built by the Metropolitan Railway;
* Northern line north of [[Highgate tube station|Highgate]] runs on tracks built by the [[Great Northern Railway (Great Britain)|Great Northern Railway]];
* Piccadilly line west of [[Hammersmith tube station (Piccadilly and District lines)|Hammersmith]] runs on tracks built by the [[London and South Western Railway]], the District Railway and the Metropolitan Railway.))

===Unit Classification===
The method of classification depends on the type of line the train operates on:

====Tube Stock====
Tube Stock is classified by the anticipated year of delivery at the time of ordering.((efn|This sometimes proves optimistic, for example the [[London Underground 1992 Stock|1992 Stock]] did not become operational until 1993.))

This system was inaugurated by the [[London Passenger Transport Board]] (LPTB) with the [[London Underground 1935 Stock|1935 Stock]]. The large number of broadly similar Tube trains built for the UERL during 1922-1934 were called (and are commonly still referred to as) [[London Underground Standard Stock|Standard Stock]] (officially re-christened Pre-1938 tube stock upon rehabilitation), although there were many detail differences. 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 [[London Underground Watford Joint Stock|Watford Joint Stock]] of the Bakerloo, the [[Great Northern & City Railway]]'s surface gauge stock, and the CLR's [[London Underground 1900 and 1903 Stock|Tunnel Stock]] and [[London Underground 1900 and 1903 Stock#Ealing Stock|Ealing Stock]] (which in turn comprised DMs of 1903 and 1915 vintage constructed to replace locos hauling trailers of 1900 vintage).

====Sub-surface 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. [[London Underground G Stock|G23 Stock]]
.
This system was commenced by the DR for its stock. When the LPTB was formed, the ex-Metropolitan Railway units were incorporated into this series (types MV, MW, T, V, VT and W). By 1960, most letters had been allocated, and the decision was taken to re-issue [[London Underground A60 and A62 Stock|A]] (for the Amersham electrification) to the new Metropolitan stock.((sfn|Bruce|1979<!-- page number required -->)) The next sub-surface types were built for the Circle and District lines, and the opportunity was taken to allocate [[London Underground C69 and C77 Stock|C]] (for the Circle line) and [[London Underground D78 Stock|D]] (for the District line) respectively, omitting B.

====Types of Unit====
On most lines, trains are formed from a pairing or triplet 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. In addition, some units have no driving cabs, and thus must always be included in the middle of a formation of units.

===Car Classification===
The different types of car used to make up electric multiple units are referred to by a series of codes, described below:

{|class="wikitable"
!Code!!Description
|-
|DM||'''D'''riving '''M'''otor car (with motors and a driving cab) 
|-
|NDM||'''N'''on-'''D'''riving '''M'''otor car (motored, but with no driving cab)
|-
|UNDM||'''U'''ncoupling '''N'''on-'''D'''riving '''M'''otor car (as NDM, but with controls at one end to permit uncoupling and shunting, but not full driving facilities)
|-
|MS||'''M'''otor '''S'''hunting car (as NDM, but with provision to split from the adjacent MS as required in depots)
|-
|T||'''T'''railer car (no motors or driving cabs)
|-
|CT||'''C'''ontrol (or 'Driving') '''T'''railer car (with a driving cab, but no motors) 
|}

On most lines, the end cars of units are described as 'A' end cars or 'D' end cars ('B' end until the 1930s). In general, the 'A' end is the north or west end and the 'D' end is the south or east, but the reverse applies on the Bakerloo line. On lines with a loop at the end that allows trains to turn round (e.g. at [[Heathrow Terminal 4  tube station|Heathrow Terminal 4]] on the Piccadilly line and [[Kennington tube station|Kennington]] on the Northern line), this system cannot apply rigidly.

===Car Numbering===
Each car carries its own unique number (although many numbers below 10000 have been reused by newer cars after the withdrawal of older trains), and unit numbers are not applied. Although car numbers have been allocated in a variety of different series over the years, two basic principles can be identified:
* A-end cars have even numbers and D-end cars have odd numbers; cars will usually be renumbered if they are turned to the opposite end. This principle was applied by the DR and continued by the LPTB.
* Cars within a unit usually either share the same last two digits, or one end uses the next odd digit after the other end's even digit; frequently when cars are swapped between units they will be renumbered to maintain this approach. This principle was introduced by the LPTB.

====1931 Numbering Series====
In 1931, the UERL began a major renumbering of all its multiple unit cars. The series was adopted by the LPTB in 1933 and renumbered stock inherited from the MR was incorporated into the UERL's series. The table below shows the number ranges used for the inherited stock and initially used by the UERL/LPTB for new stock (including the LPTB-designed M and N Stock and Q38 Stock DM cars - Q38 Stock trailers were allocated numbers in one of the new numbering series described later):

{|class="wikitable"
!Number Series!!Car Type!!Line Type!!Numbers for Inherited Stock!!Numbers for New Stock!!Numbers for Converted Stock
|-
|1-37||align=center|DM||rowspan=3 align=center|Sub-surface<br>ex-DR||rowspan=3|Surviving unrefurbished B Stock (not renumbered in 1931)||||
|-
|1000–1094||align=center|T||||
|-
|1700–1717||align=center|CT||||
|-
|2000-2999||rowspan=3 align=center|DM||align=center|Sub-surface<br>ex-MR||2200-2247 Hammersmith line stock<br>2500-2769 Main line stock((efn|Cars 2752 and 2707 were renumbered to 17000 and 20000 in 1946/1947 for testing as prototypes for A Stock. 17000 was renumbered 17001 following further modifications.))<br>2900-2940 Northern City line stock||||
|-
|3000-3999||align=center|Tube||3000-3069 and 3282-3688 ex-[[London Electric Railway|LER]]<br>3912-3999 ex-CLR||3070-3281<br>3689-3721||3723-3784 DM cars that changed ends
|-
|4000-4999||align=center|Sub-surface<br>ex-DR||4000-4390 and 4591-4645||4391-4437||4620-4642 (evens) ex-CT cars
|-
|5000-5999||rowspan=3 align=center|CT||align=center|Tube||5000-5359 ex-LER<br>5928-5999 ex-CLR||||
|-
|6000-6199||align=center|Sub-surface<br>ex-DR||6000-6022||||6100-6109 ex-DM cars
|-
|6200-6999||align=center|Sub-surface<br>ex-MR||6201-6264 Hammersmith line stock<br>6500-6735 Main line stock<br>6900-6919 Northern City line stock||||6558/6559/6561/6562 ex-trailers<br>6736-6755 ex-hauled stock
|-
|7000-7999||rowspan=3 align=center|T||align=center|Tube||7000-7059 and 7190-7570 ex-LER<br>7901-7999 ex-CLR||7060-7189||
|-
|8000-8999||align=center|Sub-surface<br>ex-DR||8000-8048 Composites<br>8200-8258 ex-DM cars<br>8500-8535<br>8700-8780 ex-DM cars||8049-8083 Composites<br>8781-8785||8084-8095 Composites, ex-Third class<br>8786-8799 ex-DM cars<br>8801-8812 ex-Composites<br>8813-8848 & 8900-8904 ex-DM cars
|-
|9000-9999||align=center|Sub-surface<br>ex-MR||9200-9259 Hammersmith line stock<br>9400-9799 Main line stock<br>9582-9599 ex-DM cars<br>9900-9968 Northern City line stock||||9479-9482 ex-CT cars<br>9800-9844 ex-hauled stock
|}

'''Notes:''' 
* Ex-MR hauled stock retained their original numbers as they did not conflict with any of the numbers allocated to the multiple unit stock; they were all numbered between 41 and 510 (511-519 were later allocated to cars converted from multiple unit to hauled stock).
* A 'Composite' car had both First and Third class seating. All Tube stock was Third class only; all ex-DR stock was Third class except those trailers identified as Composite. In the ex-MR ranges First class stock took the lowest numbers, then Composites, then Third class. The LPTB gradually declassified all stock to Third class, the process being completed in the early years of [[World War II]].
* Some cars converted to Trailers after 1935 carried a '0' prefix to their numbers, as was applied to new-build trailer cars in this period. In some cases, such cars briefly retained their original DM numbers but with a '0' prefix before being renumbered into the appropriate range for trailers.

====Later Developments====
This standard number series proved to be short lived; from 1935 onwards a variety of different series have been used, so the current list of numbers looks rather random. The table below sets out the numbering systems used for each type of London Underground stock:

{|class="wikitable"
!Number Series!!Stock!!Number Ranges!!Allocation of Numbers
|-
|11-26||align=center|[[London Underground 1986 Stock|1986]]||11-16 DM<br> 21-26 NDM||Formed 1x+2x.
|-
|100-897||align=center|[[London Underground 1973 Stock|1973]]||100-253 DM<br>300-453 UNDM<br>500-696 T<br>854-897 DM (from double-ended units)||All cars in a unit had same last two digits, except double-ended units, which were formed in a series from 854+654+855.
|-
|1xxx<br>2xxx<br>9xxx||align=center|[[London Underground 1956 Stock|1956]], [[London Underground 1959 Stock|1959]], [[London Underground 1962 Stock|1962]]||1xxx DM<br>2xxx T<br> 9xxx NDM||All cars in a unit had same middle two digits: fourth digit even for A-end cars and odd for D-end cars.
|-
|3xxx<br>4xxx||align=center|[[London Underground 1967 Stock|1967]], [[London Underground 1972 Stock|1972]], [[London Underground 1983 Stock|1983]]||3xxx DM<br>4xxx T||All cars in a unit had same last two digits: second digit even for A-end cars and odd for D-end cars.
|-
|39xx<br>49xx||align=center|[[London Underground 1960 Stock|1960]]||39xx DM<br>49xx T||Fourth digit was even for A-end cars and odd for D-end cars; the original trailers (converted from Standard Stock) were later replaced by trailers converted from 1938 Stock, whose numbers did not correspond with the DM cars.
|-
|5xxx<br>6xxx||align=center|[[London Underground A60 and A62 Stock|A]] & [[London Underground C69 and C77 Stock|C]]||5xxx DM<br>6xxx T||A Stock: four-car units, where all cars in a unit had same middle two digits, fourth digit even for A-end cars and odd for D-end cars;<br>C Stock: two-car units, where both cars had same last three digits.
|-
|7xxx<br>8xxx<br>17xxx||align=center|[[London Underground D78 Stock|D]]||7xxx DM<br>8xxx UNDM<br>17xxx T||All cars in a unit had same last three digits, except double-ended units, which were formed in a series from 7500+17500+7501.
|-
|10xxx<br>11xxx<br>12xxx<br>30xxx<br>31xxx<br>70xxx<br>90xxx<br>91xxx<br>92xxx||align=center|[[London Underground 1935 Stock|1935]], [[London Underground 1938 Stock|1938]], [[London Underground 1949 Stock|1949]]||nowrap|10xxx DM (A-end)<br>11xxx DM (D-end)<br>12xxx NDM (T when prefixed by "0")<br>30xxx UNDM (A-end)<br>31xxx UNDM (D-end)<br>70xxx T (ex-Standard Stock)<br>90xxx DM (nine-car unit A-end)<br>91xxx DM (nine-car unit D-end)<br>92xxx NDM (nine-car unit; T when prefixed by "0")||A-end & D-end DM cars had same last three digits; trailer numbers were not matched.
|-
|13xxx<br>14xxx||align=center|[[London Underground O and P Stock|O & P]],<br>[[London Underground Q38 Stock|Q38]] trailers||13xxx A-end (DM or T when prefixed by "0")<br>14xxx D-end (DM or T when prefixed by "0")||A-end & D-end DM cars had same final three digits, trailer numbers were not matched. (Q38 Stock DM cars were numbered 4xxx in the original 1931 number series.)
|-
|1xxxx (2nd use)||align=center|[[London Underground 2009 Stock|2009]]||11xxx DM<br>12xxx T<br>13xxx NDM<br>14xxx UNDM||Eight car units formed from two four-car 'blocks' in which the last three digits of each car are the same; fifth digit even for A-end cars and odd for D-end cars.
|-
|2xxxx (1st use)||align=center|[[London Underground R Stock|R]]||21xxx DM (A-end)<br>22xxx DM (D-end)<br>23xxx NDM||The third digit indicated the position of the car in the unit, A-end to D-end, from 1 to 6 in six-car units and 5 & 6 in two-car units. Each car in the unit had same last two digits.
|-
|2xxxx (2nd use)||align=center|[[London Underground S7 and S8 Stock|S Stock]]||21xxx DM<br>22xxx, 23xxx NDM<br>24xxx MS<br>25xxx NDM (de-icing)||In sets fitted with de-icing equipment, the 25xxx car replaces the even-numbered 23xxx car. Eight car units (third digit is 0 or 1) are formed from two four-car 'blocks' in which the last three digits of each car are the same; fifth digit even for A-end cars and odd for D-end cars. Seven car units (third digit is 3, 4 or 5) are the same except the odd-numbered 23xxx is omitted.
|-
|4xxxx||align=center|[[London Underground 1956 Stock|1956]]||40xxx DM (four-car A-end)<br>41xxx DM (three-car D-end)<br>42xxx DM (three-car A-end)<br>43xxx DM (four-car D-end)<br>44xxx NDM<br>45xxx T (even in four-car, odd in three-car)||All DM and NDM cars in a unit had same last three digits. All cars were renumbered into 1xxx, 2xxx & 9xxx series when 1959 Stock delivered.
|-
|51xxx<br>52xxx<br>53xxx||align=center|[[London Underground 1995 Stock|1995]]||51xxx DM<br>52xxx T<br>53xxx UNDM||All cars in a unit had same last three digits.
|-
|53xxx<br>54xxx||align=center|[[London Underground O and P Stock|CO, CP]]||53xxx DM (A-end)<br>54xxx DM (D-end)||Ex-O and P Stock; 40000 added to original number.
|-
|65xxx<br>67xxx<br>91xxx<br>92xxx<br>93xxx||align=center|[[London Underground 1992 Stock|1992]]||65xxx DM<br>67xxx NDM<br>91xxx DM<br>92xxx & 93xxx NDM||All cars in a unit had same last three digits; units in 6xxxx series are Waterloo & City line and retain their [[British Rail]] numbers.
|-
|75xxx||align=center|[[London Underground Standard Stock|Standard]]||Trailers||Ex-DT cars; 70000 added to original number.
|-
|96xxx||align=center|[[London Underground 1996 Stock|1996]]||960xx & 961xx DM<br>962xx & 963xx T<br>964xx & 965xx UNDM<br>968xx & 969xx T (fitted with de-icing equipment)<br>966xx & 967xx ST||All cars in a unit had same last two digits; unit number (1-126) is added to the car type (000=DM, 400=UNDM, 200/600/800=T) 
|}

==Notes and references==
===Notes===
((notelist))

===References===
((reflist|colwidth=20em))

===Bibliography===
((refbegin))
* ((cite book |last=Bruce |first=Graeme |title=Tube Trains Under London |edition=2nd |year=1979 |orig-year=1968 |publisher=London Transport  |isbn=0-85329-095-4 ))
* ((cite book |last=Hardy |first=Brian |title=London Underground Rolling Stock |chapter=Unit Formations |edition=14th |publisher=Capital Transport |year=1997 |isbn=1-85414-193-7 |ref=none))
* ((cite book |last=Hardy |first=Brian |title=London Underground Rolling Stock  |chapter=Introduction |edition=15th |publisher=Capital Transport |year=2002 |isbn=1-85414-263-1 |ref=none))
* ((cite book |last=Hardy |first=Brian |title=London Underground Rolling Stock  |chapter=Unit Formations|edition=15th |publisher=Capital Transport |year=2002 |isbn=1-85414-263-1 |ref=none))
((refend))

((London Underground rolling stock))
((British railway rolling stock numbering and classification))

((DEFAULTSORT:London Underground Rolling Stock Numbering And Classification))
[[Category:London Underground rolling stock]]

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