Sutton Loop Line

{{Short description|Railway line in London}}

{{Use dmy dates|date=January 2025}}

{{Use British English|date=November 2017}}

{{Infobox rail line

| name = Sutton Loop Line

| color =

| logo =

| logo_width =

| image = Sutton (Surrey) station west junction.JPG

| image_width = 300px

| caption = Sutton platform 2 looking towards West junction with the St Helier Line

| elr = {{plainlist|

• SMS1 (Streatham South Jn–Wimbledon)
• SMS2 (Wimbledon–Sutton)

}}

| type = Heavy rail

| system = National Rail

| status = Operational

| locale = London Boroughs of Merton and Sutton

| start = {{stnlnk|Streatham}} South Jn

| end = Sutton

| stations = 14

| routes = {{plainlist|

• Thameslink
• Southern

}}

| daily_ridership =

| open =

| close =

| owner = Network Rail

| operator = Govia Thameslink Railway

| character =

| depot = {{plainlist|

• Bedford Cauldwell for Thameslink
• Selhurst for Southern

}}

| stock = {{plainlist|

• Class 377 "Electrostar"
• Class 700 "Desiro City"

}}

| linelength =

| tracklength =

| tracks = {{plainlist|

• 2
• 1 bi-directional line at {{stnlnk|Wimbledon}}

}}

| gauge = {{RailGauge|sg|allk=on}}

| electrification =

| speed = Maximum 60 mph

| elevation =

| map = 300px
(Click to expand)

| map_state = uncollapsed

}}

{{Sutton Loop|collapse=y}}

The Sutton Loop Line,{{cite book |publisher= Network Rail |title=Southern Appendix |volume=Module SO |date=Apr 2001 |id=A0260A03 |page=1/272}} also known as the Wimbledon Loop,{{cite press release |url= https://www.gov.uk/government/news/government-safeguards-future-of-the-wimbledon-loop |title=Government safeguards future of the Wimbledon Loop |publisher= Department of Transport |date=21 January 2013}} is a railway line that diverges from the Portsmouth Line at Streatham South junction and rejoins it near Sutton station.

Trains leave southwards from {{stnlnk|Streatham}} to enter the loop and then return going northwards. The short section between {{stnlnk|West Sutton}} station and West junction is known as the "Wall of Death",Quail Map 5 - England South & London Underground [page 22] September 2002. 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.