Unsolicited Brake Applications (2)

Questions to the Mayor of London – answered on 11th April 2022.

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Photo of Nicholas Rogers Nicholas Rogers Conservative

What does TfL believe is causing these unsolicited brake applications?

Photo of Sadiq Khan Sadiq Khan Mayor of London

There are no systemic faults affecting the western boundary automatic signalling transitions. Unsuccessful transitions have been attributed to individual train and signalling faults, rectified at the time.

Transport for London (TfL) believes there are three factors contributing to the unsolicited brake applications during automatic transition at the eastern boundary.

TfL is taking the following action to address these issues:

1.Defective CBTC hardware on the infrastructure has been replaced. The health status and sensitivity of all other CBTC transmission equipment in the area of the transition is being progressively tested

2.Trains which have been more susceptible to unsuccessful transitions have been returned to the maintenance depot and inspected for hardware defects and rectified

3.A specialist WiFi consultancy has been engaged to identify sources of interference and recommend mitigation measures. This has already resulted in the changing of the public WiFi channel layout on the trains and WiFi channels used by the CBTC