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The Sutton Loop Line,[1] also known as the Wimbledon Loop,[2] is part of Thameslink and is the circular route formed where the St Helier line[1] diverges from the Portsmouth Line[1] at Streatham South junction and rejoins it near Sutton station. Trains leave southwards from Streatham to enter the loop and then return going northwards. The short section between West Sutton station and West junction is known as the "Wall of Death",[3] possibly due to the very steep concrete walls to the cutting on both sides and the sharpness of the curve which resemble the motorcycle ride at a funfair.

Sutton Loop Line
Sutton (Surrey) station west junction.JPG
Sutton platform 2 looking towards West junction with the St Helier Line
TypeHeavy rail
SystemNational Rail
LocaleGreater London
South of England
OwnerNetwork Rail
Depot(s)Bedford Cauldwell for Thameslink
Selhurst for Southern
Rolling stockClass 377 "Electrostar"
Class 455
Class 700 "Desiro City"
Number of tracks2
1 bi-directional line at Wimbledon
Track gauge1,435 mm (4 ft 8 12 in) standard gauge
Operating speedMaximum 60 mph [1]
Sutton Loop Line
St Helier Line
Streatham South Jn
Eastfields LC
Haydons Road
Mitcham Eastfields
Wimbledon London Underground Tramlink
Mitcham Junction Tramlink
Wimbledon Chase
South Merton
Morden South
St Helier
Sutton Common
West Sutton




Traction current is supplied at 750 volts DC via the Third Rail. The supply for this is overseen by Selhurst Electrical Control Room.[1] Signalling is Track Circuit Block with multiple aspect colour light signals, controlled by Victoria Southern Power Signal Box.[1] The line is double track throughout, except where a short bi-directionally signalled single line section passes through Wimbledon station platform 9. Originally the Down St Helier Line used platform 10 at Wimbledon, but this is now used for the Croydon Tramlink terminus which currently comprises a single platform at the southern end, split into two sections so two trams can be held at the same time.[4]




Thameslink runs services from Luton and St Albans, via Blackfriars round the loop. Clockwise services are described as "Sutton via Mitcham Junction" and anti-clockwise as "Sutton via Wimbledon". Occasionally, during service disruption or when the core section of the Thameslink route is closed, Sutton Loop services start and end at London Bridge 'low level' station (i.e. the terminating platforms, 10-15).

Recent proposals were to increase the frequency of the Thameslink service by terminating at Blackfriars. This would have allowed the trains through the core section to be replaced with longer trains which could not use the loop, but this did not proceed due to objections from loop passengers about the withdrawal of their through service.[5]


Southern runs a peak service round the loop (anti-clockwise in the morning peak, clockwise in the evening peak) to and from London Bridge.

Southern also operates regular services from London Victoria towards Epsom, Dorking and Horsham. Epsom services call at all stations between Mitcham Eastfields and Sutton, whilst services to Dorking and Horsham only call at Carshalton and Sutton.


  1. ^ a b c d e f Network Rail (April 2001). Southern Appendix. Module SO. p. 1/272. A0260A03. Retrieved 2012-01-12
  2. ^ "Department of Transport press release". "Government safeguards future of the Wimbledon Loop". "UK government".
  3. ^ Quail Map 5 - England South & London Underground [page 22] September 2002 (Retrieved 2012-01-12)
  4. ^
  5. ^ Herne Hill website