I would like submit a freedom of information request for the number of times each Tube line has suffered delays due to signalling problems, and the number of hours and minutes of delays that has resulted in. I would like you to provide data from January 2016 until when it is most recently available. Please provide the data in spreadsheet form

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TfL Ref: FOI-4537-1718

Thank you for your request received by Transport for London (TfL) on 14 February 2018 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. I can confirm we do hold the information you require.

There is a variety of signalling systems in use on the Underground network, some dating back to the 1950s and some having gone into use in 2012. The range of different eras that the technology comes from presents different challenges in ensuring signal reliability. However, we are tackling this problem in a number of ways.

The Four Lines Modernisation programme will transform the signalling on the Circle, District, Hammersmith & City and Metropolitan lines. The change to computer-based signalling will improve the speed of trains and also make both the signals and trains perform more reliably. The £5.2bn programme will make a huge difference to 40 per cent of the Tube network, boosting capacity and making journeys quicker.

New signalling will also be introduced onto the Bakerloo, Central, Piccadilly and Waterloo & City lines as part of the upgrade of Deep Tube lines. The first line to benefit will be the Piccadilly line, with the next phase of the project set to start later this year.

We have also created a team as part of our organisational change whose sole focus is working on signalling issues. We will continue to work on maintenance across many different aspects of ensuring reliability on the network, but this new 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.

Please see the information you have requested in the table below.

Data From 1st January 2016 - 3rd February 2018
Line	Number of Signalling Issues	Delay (minutes)
Bakerloo	218	2023
Circle and Hammersmith & City	358	4501
Central	537	5380
District	924	13653
Jubilee	422	3530
Metropolitan	529	8603
Northern	230	3386
Piccadilly	597	8524
Victoria	95	1348
Waterloo & City	63	2121

If this is not the information you are looking for, or if you are unable to access it for some 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

Lee Hill

Senior FOI Case Officer

FOI Case Management Team

General Counsel

Transport for London

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