I am requesting all details relating to signal failures on London Underground I would like the date of the signal failures, the reason why the signal failure , the line affected and steps taking to prevent this happening by tfl Please not Failure to provide the relevant information in an acceptable time frame will be seen as as attempt to pervert the cause of justice by tfl and shall be met with the full weight of legal system

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TfL Ref: FOI-1800-1920

Thank you for your request received by Transport for London (TfL) on 17^th September 2019 asking for information about signal failures on the London Underground.

Your request has been considered in accordance with the requirements of the Freedom of Information Act and our information access policy. 

Specifically you asked:

“Information on all signal failures in the last 5 years:

I am requesting all details relating to signal failures on London Underground

I would like the date of the signal failures, the reason why the signal failure , the line affected and steps taking to prevent this happening by tfl”

I can confirm that we hold the requested information, which is provided in the attached spreadsheet (note that you may need to expand the width of some columns to read the data in full).

Under a major programme of modernisation, work has begun to install a state-of-the-art signalling system across the Circle, District, Hammersmith & City and Metropolitan lines. This will allow us to run trains closer together and will see reliability, frequency and journey time improvements across all four lines by 2023. The combination of new S-Stock trains and the new signalling system will see capacity increases of 33% across all four lines.

As part of our recent organisational change, a team whose sole focus is working on signalling issues has been created. We will continue to work on maintenance across many different aspects of ensuring reliability on the network, but this team will work to drive reliability and make sure that our customers’ priorities are at the forefront of all work we undertake to improve and maintain signals. We have continued to push for a reduction in ‘Service Affecting Faults’ across the signalling system and last year reduced the amount of signal failures by 12.9 per cent.

If this is not the information you are looking for, or if you are unable to access it for any reason, please do not hesitate to contact me.

Please see the attached information sheet for details of your right to appeal as well as information on copyright and what to do if you would like to re-use any of the information we have disclosed.

Yours sincerely,

David Wells

FOI Case Officer

FOI Case Management Team

General Counsel

Transport for London

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