East and West London Signalling Boundaries (1)

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

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Photo of Nicholas Rogers Nicholas Rogers Conservative

Giving as much detail as possible, please update the Assembly on any and all issues that Crossrail is having at the East and West London signalling boundaries.

Photo of Sadiq Khan Sadiq Khan Mayor of London

At the east and west signalling boundaries, Elizabeth line trains are designed to automatically transition between the Network Rail signalling system and the Communications-Based Train Control (CBTC) Automatic Train Operation signalling system on the Transport for London managed infrastructure. The transition is initiated by the CBTC signalling system and relies on the transmission of data over WiFi between the infrastructure and the trains.

If CBTC WiFi data is not being correctly transmitted to and from the infrastructure, the signalling system will fail to a safe state and automatically apply the brakes to bring the train to a stand. Please also see my response to Mayor’s Question 2022/1250.