Project Overview

Stansted Airport Railway Station is below London Stansted Airport Terminal Building in Essex, situated at the end of a short branch from the West Anglia Main Line. The branch was constructed and opened in 1991 along with the airport’s terminal building.
The signalling in the area was controlled by Stansted (i.d. SSD) Solid State Interlocking (SSI), which was housed at Liverpool Street Signalling Control Centre. The area was provided with 25kV a.c. overhead electrification.

Stansted Airport had planning permission to expand from 15 million passengers per annum to 25 million. As part of the planning permission, Stansted Airport Limited had to provide additional platform capacity at Stansted Airport Station. Platform 1 & 3 used by National Express and platform 2 was used by Cross Country diesel rolling stock to the buffer stop, making it suitable for some four-car trains only.

The requirement of the scheme was to extend either Platform 1 or Platform 3 for 16-car use and to extend Platform 2 to accommodate four 23.5m long cars. Signalling Scheme plan was developed during GRIP stage 4 along with the supporting document for the final option. This work majorly included alterations to track circuits, extensive works on platforms with new CD/RA and TRS indicators along with plungers, relocation of TPWS loops and bufferstop. Data changes were proposed to Stanstead SSI. Changes were proposed to control tables to alter Lime street controls for additional car formations.