sr multiple unit numbering and classification

The Southern Railway created numbering and classification systems for its large fleet of Electric multiple units that were perpetuated by the Southern Region of British Rail until the early 1980s, when the impact of TOPS was felt. Even now, some stock have still been allocated Southern-style classifications in a semi-official manner. =Unit Numbering= Unit numbers were allocated in a series commencing from 1001, which followed the set numbers given to semi-fixed formations of hauled coaching stock, 1-1000. Different types of unit were given numbers according to the following division:

  1001-1200: Unpowered trailer units for working with 3Sub stock             (this series was later expanded to include unit numbers 989-1000)  1201-1800: 3Sub stock (ex-LSWR units had 1200 added to their original number)  1801-1999: Two-car inner-suburban stock (e.g. 2Nol)  2001-2899: Two-car outer-suburban stock (e.g. 2Bil)  2901-3999: Four- Five- and Six-car outer-suburban stock (e.g. 4Lav)  4001-4999: Four-car inner-suburban stock (4Sub and 4DD)   5001-5599: British Railways four-car inner-suburban stock (4EPB)  5601-6999: British Railways two-car stock (e.g. 2Hap)  7001-7999: British Railways four-car outer-suburban stock (e.g. 4Cig)       8001: Temporary eight-car formation (8Vab)    S1-S101: Departmental (non-revenue earning) stock

This series was perpetuated by the Southern Region of BR, though with modifications, as older set numbers were reused for the following different types:

   001-099 : Parcels and departmental stock (Former Sxxx units renumbered into this series)   301-999 : Trailer Control stock (first digit indicated number of cars, e.g. 301 = 3TC)  1001-1499: Diesel Electric Multiple Units (e.g. 6S)

The 2Pep stock reused number 2001, the 4Rep stock reused numbers from 3001 and the 4Pep stock reused numbers 4001/4002. This series was abandoned only in 1983, when units were renumbered to fit in with the TOPS classification system, which had already (nominally) been in use for a decade! =Classification= The early AC overhead electric multiple unit types were referred to by a two-letter code. This was adapted for the DC third rail system that was adopted as standard by the Southern Railway, with unit type being given a three-letter code (sometimes two-letters) prefixed by the number of carriages within each unit, e.g. 4Sub for a 4-car Suburban type set. The Southern Region of British Rail perpetuated this method of classification, and the same principles were also adopted for their fleet of Diesel Electric Multiple Unit stock, but these types only used single letter codes. The last types to be officially allocated a designation in this series was the Pep stock of the early 1970s. However, some types built since then have been given semi-official designations in this style. NB: This was 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.

AC Overhead EMUs

eaning
lign=center\|CP	Crystal Palace Stock
lign=center\|CW	Coulsdon & Wallington Stock
lign=center\|SL	South London Stock

DC Third Rail EMUs

R Class	Meaning
lign=center\|GLV	align=center\|489	Gatwick Luggage Van
lign=center\|MLV	align=center\|419	Motor Luggage Van
lign=center\|TLV	align=center\|499	Trailer Luggage Van
lign=center\|2Bil	align=center\|401	Bi-Lavatory Stock
lign=center\|2EPB	align=center\|416	Electro-Pneumatic Brake Stock
lign=center\|2Hal	align=center\|402	Half a Lavatory Stock
lign=center\|2Hap	align=center\|414	Hal Electro-Pneumatic Brake Stock
lign=center\|2Nol	align=center\|-	No Lavatory Stock
lign=center\|2Pan	align=center\|402	Parcels and Newspapers Stock
lign=center\|2Pep	align=center\|446	Prototype Electro-Pneumatic Brake Stock
lign=center\|2Sap	align=center\|418	Second-Class Only Hap Stock
lign=center\|2SL	align=center\|-	South London Stock
lign=center\|2Wim	align=center\|-	Wimbledon Line Stock
lign=center\|3Cop	align=center\|421	Coastway Open Plan
lign=center\|3Sub	align=center\|-	Suburban Stock
lign=center\|3TC	align=center\|492	Trailer Control Stock
lign=center\|3Tis	align=center\|486	Vectis (Isle of Wight) Stock
lign=center\|4Bep	align=center\|412	Buffet Electro-Pneumatic Brake Stock
lign=center\|4Big	align=center\|422	Buffet Brighton Stock
lign=center\|4Buf	align=center\|404	Buffet Stock
lign=center\|4Cap	align=center\|413	Coastway Hap Stock
lign=center\|4Cep	align=center\|411	Corridor Electro-Pneumatic Brake Stock
lign=center\|4Cig	align=center\|421	Corridor Brighton Stock
lign=center\|4Cor	align=center\|404	Coridor Stock
lign=center\|4Des	align=center\|450	Desiro
lign=center\|4DD	align=center\|-	Double Decker Stock
lign=center\|4EPB	align=center\|415	Electro-Pneumatic Brake Stock
lign=center\|4Gri	align=center\|404	Griddle Car Stock
lign=center\|4Jop	align=center\|458	Juniper Open Plan
lign=center\|4Lav	align=center\|-	Lavatory Stock
lign=center\|4Pep	align=center\|445	Prototype Electro-Pneumatic Brake Stock
lign=center\|4Rep	align=center\|432	Restaurant Electro-Pneumatic Brake Stock
lign=center\|4Res	align=center\|404	Restaurant Stock
lign=center\|4Sub	align=center\|405	Suburban Stock
lign=center\|4TC	align=center\|438	Trailer Control Stock
lign=center\|4Tep	align=center\|412	Temporary Bep Stock
lign=center\|4Vec	align=center\|485	Vectis (Isle of Wight) Stock
lign=center\|4Veg	align=center\|427	Vep Gatwick Express Stock
lign=center\|4Vep	align=center\|423	Vestibule Electro-Pneumatic Brake Stock
lign=center\|4Vip	align=center\|423	Vep Intermediate Plan
lign=center\|4Vop	align=center\|423	Vep Open-Plan
lign=center\|5Bel	align=center\|403	Brighton Belle Pullman Stock
lign=center\|5Des	align=center\|444	Desiro
lign=center\|5TCB	align=center\|438	TC and Buffet Stock
lign=center\|5Wes	align=center\|442	Wessex Stock
lign=center\|6Cit	align=center\|-	City Express Stock
lign=center\|6Pan	align=center\|-	Pantry Stock
lign=center\|6Pul	align=center\|-	Pullman Stock
lign=center\|6Rep	align=center\|431	Reformed Rep Stock
lign=center\|6TC	align=center\|-	Trailer Control Stock
lign=center\|7TC	align=center\|-	Trailer Control Stock
lign=center\|8Dig	align=center\|422	Dedicated Brighton Stock
lign=center\|8Gat	align=center\|460	Gatwick Express Stock
lign=center\|8Mig	align=center\|421	Miniature Buffet and Cig Stock
lign=center\|8Vab	align=center\|480	Vestibule Autobrake Buffet Stock

Diesel Electric Multiple Units

R Class	Meaning
lign=center\|3D	align=center\|207	Oxted Line Stock
lign=center\|3H	align=center\|205	Hampshire Stock
lign=center\|3R	align=center\|206	Reading Line Stock
lign=center\|3T	align=center\|204	Hampshire and added Trailer Stock
lign=center\|6B	align=center\|203	Hastings Buffet Stock
lign=center\|6L	align=center\|202	Hastings Long-bodied Stock
lign=center\|6S	align=center\|201	Hastings Short-bodied Stock

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