Our Ref:         FOI-1756-1718

Thank you for your request received on 5 October 2017 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.

In order to reduce signal failures we are replacing old track, improving drainage, cleaning block joints at regular intervals and improving the insulation between track sections using a new type of rail joint. We are also upgrading signalling systems across the network.

Please find the requested information below. Please note that we also regularly publish data on our website the number of signal failures that resulted in a delay of over two minutes: https://tfl.gov.uk/corporate/publications-and-reports/underground-services-performance.

The table below is all the incidents / delays to service that are related to signal assets:

Period/Line 2016-17 P07 2016-17 P08 2016-17 P09 2016-17 P10 2016-17 P11 2016-17 P12 2016-17 P13 2017-18 P01 2017-18 P02 2017-18 P03 2017-18 P04 2017-18 P05 2017-18 P06 Grand Total
Bakerloo 11 10 14 7 8 16 14 11 6 10 6 3 1 117
C&H 7 10 10 13 10 14 10 18 11 14 21 16 6 160
Central 9 22 11 20 17 16 22 13 29 20 26 13 15 233
District 36 30 22 28 35 33 26 33 27 48 29 34 29 410
Jubilee 16 11 23 15 27 23 10 17 13 12 18 12 13 210
Metropolitan 15 20 19 11 16 16 19 12 18 20 19 17 16 218
Northern 7 6 8 6 3 9 11 6 10 7 5 17 8 103
Piccadilly 11 21 21 17 13 14 16 25 20 38 30 15 29 270
Victoria 3 3 4 5 2 7 4 3 2 1 3  7 44
Waterloo & City 2 3 3 1 4 3 3 1 2 4 2 1  29
Grand Total 117 136 135 123 135 151 135 139 138 174 159 128 124 1794

Please see the dates covered by the periods in the table below:

Year 2016/17 2017/18
Period Start End Start End
1 01/04/2016 30/04/2016 01/04/2017 29/04/2017
2 01/05/2016 28/05/2016 30/04/2017 27/05/2017
3 29/05/2016 25/06/2016 28/05/2017 24/06/2017
4 26/06/2016 23/07/2016 25/06/2017 22/07/2017
5 24/07/2016 20/08/2016 23/07/2017 19/08/2017
6 21/08/2016 17/09/2016 20/08/2017 16/09/2017
7 18/09/2016 15/10/2016 17/09/2017 14/10/2017
8 16/10/2016 12/11/2016 15/10/2017 11/11/2017
9 13/11/2016 10/12/2016 12/11/2017 09/12/2017
10 11/12/2016 07/01/2017 10/12/2017 06/01/2018
11 08/01/2017 04/02/2017 07/01/2018 03/02/2018
12 05/02/2017 04/03/2017 04/02/2018 03/03/2018
13 05/03/2017 31/03/2017 04/03/2018 31/03/2018

If this is not the information you are looking for please feel free to contact me.

Please see the attached information sheet for details of your right to appeal.

Yours sincerely

Gemma Jacob
FOI Case Officer
FOI Case Management Team
General Counsel
Transport for London

[email protected]