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Selhurst triangle

Current constraints

The Selhurst triangle is one of the busiest and most complex parts of the rail network because of the high number of flat junctions and the frequency of trains.

Regular travellers through the area will know that trains often have to wait at red signals while other trains pass, causing knock-on delay and making it difficult to recover the service when an incident occurs.

Our proposal

We propose to provide ‘grade separation’ of all the key rail junctions in the Selhurst triangle. To achieve this, new viaducts, bridges and dive-unders are proposed to separate the tracks as they cross each other. This means trains should no longer have to wait at a signal for others to pass in front.

These works would be completed in phases with new railway constructed offline and lifted into place to reduce disruption to services.

We are also proposing to build three additional tracks north of East Croydon station, increased from two in our original designs, to maximise the performance and capacity benefits delivered to passengers.

6 new viaducts comprising earthworks, embankments, reinforced concrete boxes.

40km of new track
40km of new track


  • Less waiting at red signals
  • Improved punctuality
  • Capability for more trains to run
  • New, modern and more reliable assets
  • New sidings to further improve operations
  • Signalling and rail equipment replaced to provide long-term reliability
Indicative flyover structures
Indicative dive-under structure
Indicative aerial view of the Selhurst Junction area, looking south