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Undid revision 1217123132 by 86.177.237.10 (talk) - unsourced

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{{Use dmy dates|date=November 2016}}
{{Use British English|date=November 2016}}
{{Infobox train
| background = #006600
| name = Southern Railway 4-LAV
| image = 4-lav emu.jpg
| imagealt =
| caption = 4-LAV unit approaching Coulsdon North c.1968
| interiorimage =
| interiorimagealt =
| interiorcaption =

| service = 1932–1969
| manufacturer = Southern Railway
| factory = [[Eastleigh Works]]
| family =
| replaced =

| yearconstruction = 1930–1932 (33),<br>1939–1940 (2)
| yearservice =
| refurbishment =
| yearscrapped =
| numberconstruction=
| numberbuilt = 35
| numberservice =
| numberpreserved =
| numberscrapped = All

| formation = Power car + 2 trailer cars + power car
| fleetnumbers = Sets 1921–1953, later 2921–2955
| capacity = 70 first class,<br>204 third class
| operator = [[Southern Railway (UK)|Southern Railway]]<br />[[British Railways]]
| depots =
| lines = London Victoria to Brighton and Worthing

| carbody = Steel panelled, wooden body, on steel underframe
| trainlength = {{convert|257|ft|2+1/2|in|m|2|abbr=on}}
| carlength =
| width =
| height =
| floorheight =
| platformheight =
| entrylevelorstep =
| art-sections =
| doors =

| maxspeed =
| weight = {{convert|139|LT}}
| acceleration =
| deceleration =
| traction = Four {{convert|275|hp|kW|abbr=on}} traction motors
| engine =
| poweroutput = {{convert|1100|hp|kW|abbr=on}}
| transmission =
| aux =
| powersupply =
| hvac =
| electricsystem = 750 V DC
| collectionmethod = [[Third rail]]
| uicclass = Bo′2′+2′2′+2′2′+2′Bo
| aarwheels =
| bogies =
| brakes = Automatic air
| safety =
| coupling = Screw-link
| multipleworking = Standard SR
| gauge = {{RailGauge|ussg}}
}}

The [[Southern Railway (UK)|Southern Railway (SR)]] gave the designation '''4-LAV''' to the [[electric multiple unit]]s built to work the semi-fast services on the route between London and Brighton. None of these units survived long enough in [[British Rail]] ownership to be allocated a [[TOPS]] class.

==Construction==
The original series of '''4-LAV''' ('''4'''-car '''Lav'''atory stock) units, (numbers 1921–1953), were built at [[Eastleigh Works|Eastleigh carriage works]] during 1931 and 1932 for use on the newly electrified [[Brighton Main Line|London to Brighton line]]. They were fitted with four [[Metropolitan-Vickers]] 275 h.p. traction motors. Despite the prominence given to the lavatory provision in the SR designation, there was actually only one vehicle containing lavatories in the whole four-car unit, and due to the lack of corridors in the unit, only passengers in that coach had access to them. The units were renumbered 2921–2953 in the January/February 1937 renumbering of SR EMUs.

Two further units, (numbers 2954 and 2955) were added to stock in 1940, under the direction of [[Oliver Bulleid]]. These were fitted with [[English Electric]] 275 h.p. traction motors.<ref name="ABC"> The ABC of British Railway Locomotives: Combined Volume, Sixth Edition, Winter 1961/2, Ian Allan Ltd., 1961. p.251.</ref>

The DMBT (Driving Motor Brake Third) had a full-width cab with a guard's compartment behind, and seven third class compartments seating 70. The TC (Trailer Composite) had five first-class and four third-class compartments seating 40 in each class. The TCL (Trailer Composite with Lavatory) had five first-class and three third-class compartments seating 30 and 24, respectively, with a toilet at each end.

One unit, number 2926, was fitted with one [[British Rail Class 402|2-HAL]] type motor coach.<ref>ABC, 1961 p.251</ref>

==Use==
Throughout their careers they operated the slower services on the [[Brighton Main Line|London to Brighton line]] between either [[London Bridge railway station|London Bridge]] or [[London Victoria station|Victoria]] and [[Brighton railway station]]. They were also used on stopping trains on the [[Arun Valley Line]] and on the Sussex coast lines to the [[East Coastway Line|east]] and [[West Coastway Line|west]] of Brighton.

==Formations==
Initial formations of these units were as follows (cars not always formed in numerical order):
{| class="wikitable"
!Unit Numbers
! {{abbr|DMBT|Driving Motor Brake Third}}
! {{abbr|TCL|Trailer Composite with Lavatory}}
! {{abbr|TC|Trailer Composite}}
! {{abbr|DMBT|Driving Motor Brake Third}}
|-
|1921–1953 / 2921–2953
|10501–10565 (odds)
|12001–12033
|11501–11533
|10502–10566 (evens)
|-
|2954–2955
|10497–10499
|11999–12000
|11534–11535
|10498–10500
|}

==Withdrawal==
The majority of the 4-LAV units were withdrawn from ordinary passenger service in 1968, with the final few going in April 1969, being replaced on their duties by new 4-VEP sets. Almost all the units were scrapped, but some of the 1940-built cars survived in departmental (non-revenue earning) use for several more years. However, no 4-LAV stock exists today.

==References==
{{reflist}}
*{{Marsden-SouthernEMU1|pages=24–27}}

{{British Rail EMU}}

[[Category:Southern Railway (UK) electric multiple units|4LAV]]
[[Category:British Rail electric multiple units|SR 4Lav]]
[[Category:Train-related introductions in 1932]]
[[Category:750 V DC multiple units]]

SR Class 4Lav - Revision history

imported>Danners430: Undid revision 1217123132 by 86.177.237.10 (talk) - unsourced