Editing SR Class SL

{{Use dmy dates|date=November 2016}}
{{Use British English|date=November 2016}}
{{Infobox Train
| background       = #503300;color:lightgoldenrodyellow
| name             = LB&SCR South London stock
| image            = Elevated Electric Train at Wandsworth c 1909.jpg
| imagesize        = 
| caption          = SL stock at Wandsworth Road station,<br>about 1909
| interiorimage    = 
| interiorcaption  = 
| service          = 1909 - 1928
| manufacturer     = [[Metro-Cammell|Metropolitan Amalgamated Carriage & Wagon Co. Ltd]]
| factory          = 
| family           = 
| replaced         =
| yearconstruction =
| yearservice      =
| refurbishment    = Rebuilt as [[Direct current|DC]] units 1928/9
| yearscrapped     = 
| numberbuilt      = Eight 3-car sets<br>later rebuilt as 16 2-car sets
| numberservice    = 
| numberpreserved  = 
| numberscrapped   = 
| formation        = 3 cars sets: {{abbr|DMBT|Driving Motor Brake Third}}-{{abbr|TF|Trailer First}}-DMBT<br>later 2 car sets: DMBT-{{abbr|DTC|Driving Trailer Composite}}
| fleetnumbers     = 
| capacity         = 3-sets: 74 First, 144 Third
| operator         = [[London, Brighton and South Coast Railway]],<br>[[Southern Railway (Great Britain)|Southern Railway]]
| depots           = 
| lines            = 
| carbody          = 
| trainlength      =
| carlength        = {{convert|63|ft|7|in|m|2|abbr=on}}
| width            = {{convert|9|ft|3|in|m|2|abbr=on}}
| height           = 
| floorheight      = 
| platformheight   = 
| entrylevelorstep = 
| art-sections     = 
| doors            = 
| maxspeed         = 
| weight           = DMBT: {{convert|54|LT|t ST|1}}<br>TF: {{convert|30|LT|t ST|1}}<br>DTC: {{convert|20.40|LT|t ST|1}}
| acceleration     = 
| deceleration     = 
| traction         = 
| poweroutput      = 3-sets: {{convert|920|hp|kW|0|abbr=on}};<br>2-sets: {{convert|460|hp|kW|0|abbr=on}}
| transmission     = Four Winter Eichberg traction motors of {{convert|115|hp|0|abbr=on}} each.
| aux              = 
| powersupply      = 
| hvac             = 
| electricsystem   = 6.7 [[Volt|kV]] [[Alternating current|AC]] [[overhead line]]s 
| collectionmethod = [[Bow collector]]
| uicclass         = 
| bogies           = 
| brakes           = 
| safety           = 
| coupling         = 
| multipleworking  = 
| gauge            = {{Track gauge|ussg|allk=on}}
}}
The [[Southern Railway (UK)|Southern Railway (SR)]] in the UK gave the designation '''SL''' to the fleet of [[Alternating current|AC]] ''[[Overhead lines|overhead]]'' [[electric multiple unit]]s used on the [[South London Line]] between [[London Victoria station|Victoria]] and [[London Bridge station]]. These had been built by the [[London, Brighton and South Coast Railway]] in 1909, but with the abandonment of the ''Elevated Electric'' service in 1928 they were converted to [[Direct current|DC]] [[third rail]] units.

==Construction==
The '''SL''' ('''S'''outh '''L'''ondon stock) units were built in 1909 for use on the [[London, Brighton and South Coast Railway|LBSCR]] AC overhead electrified lines in South London. This stock comprised eight three-car units, originally formed Driving Motor Brake [[Travel class#Trains|Third]] + Trailer [[Travel class#Trains|First]] + Driving Motor Brake Third. They were built by the [[Metro Cammell|Metropolitan Amalgamated Carriage & Wagon Company]] at [[Birmingham]] and each motor coach had four {{convert|115|hp}} [[Repulsion motor|Winter Eichberg motors]].

The Trailer First cars were later removed and used as locomotive-hauled stock, from when the driving cars were paired with former loco-hauled coaches converted to Driving Trailer Composite cars.

After the replacement of the AC overhead equipment by the standard SR 660 V DC third-rail system on 17 June 1928,<ref>{{cite book |last=Moody|first=G.T. |year=1968 |title=Southern Electric 1909-1968|location=London|publisher=Ian Allan |page=25 }}</ref> these units were rebuilt. The Driving Motor cars were paired together again to form eight units designated '''[[SR Class 2SL|2SL]]'''. The Trailer First cars (which had been out of EMU stock for nearly twenty years) were included in this programme, and were rebuilt into Driving Motor and Driving Trailer pairs to form four units designated '''[[SR Class 2Wim|2Wim]]''', for use on the Wimbledon-West Croydon line.

==Formations==
The LB&SCR purchased sufficient cars for 8 permanent sets, numbered 1E to 8E. However, later Brighton practice was to dispense with fixed sets.
{| class="wikitable"
|-
! Type !! LB&SCR No. !! SR No.
|-
| DMBT || 3201/03/04/06/07/09/10/12/13/15/16/18/19/21/22/24 || 8601–8616
|-
| TF || 3202/05/08/11/14/17/20/23 || 7644–7651
|-
| DTC || 3225–3230, 4057–4060, 4065–4068 || 9811–9824 
|}

When the units were reformed into 2-car sets, 14 driving trailers were provided for 16 driving motor cars, because it was found that the motor cars required more time under maintenance. <ref>{{cite book |last=Brown|first=David |year=2010 |title=Southern Electric: A New History |location=Crowthorne |publisher=Capital Transport Publishing |page=93 |isbn=978-1854143303 }}</ref>

==References==
{{reflist}}
*{{cite book |last=Gould |first=David |year=1995 |title=Bogie Carriages of the London, Brighton and South Coast Railway |location=Headington, Oxford |publisher=The Oakwood Press |pages=168–190 |isbn=0-85361-470-9}}
*{{cite book |last=Goslin |first=Geoff |year=2002 |title=London's Elevated Electric Railway |location=Colchester |publisher=Connor & Bulter Ltd |isbn=0-947699-35-X}}
*{{cite book |last=Golding |first=Brian |year=2009 |title=A Pictorial Record Of Southern Electric Units |location=Corhampton, Southampton |publisher=Noodle Books |isbn=978-1-906419-34-9}}
*[http://www.southernelectric.org.uk/features/historical-features/fleet_ac.html Southern Electric Group; SEG Historical Features LBSCR A.C. Fleets] {{Webarchive|url=https://web.archive.org/web/20150508111740/http://www.southernelectric.org.uk/features/historical-features/fleet_ac.html |date=8 May 2015 }}
*{{Marsden-SouthernEMU1|pages=11, 92}}

{{British Rail EMU}}

{{DEFAULTSORT:Sr Class Sl}}

[[Category:British Rail electric multiple units|SR SL]]
[[Category:London, Brighton and South Coast Railway]]
[[Category:Southern Railway (UK) electric multiple units|SL]]
[[Category:Train-related introductions in 1909]]
[[Category:Metropolitan Cammell multiple units]]