How many signal failures were recorded on the Northern line at peak times (0630-0930 and 1600-1900) between: • 1st January 2015 and 31st December 2015 • 1st January 2016 and 31st December 2016 • 1st January 2017 and 31st December 2017 • and so far in 2018? Information should be made available in electronic form if possible.

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Dear

Our ref: FOI-4935-1718

Thank you for your request received by Transport for London (TfL) on 19 March 2018.

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. You asked:

How many signal failures were recorded on the Northern line at peak times (0630-0930 and 1600-1900) between:

• 1st January 2015 and 31st December 2015
• 1st January 2016 and 31st December 2016
• 1st January 2017 and 31st December 2017

and so far in 2018?

The Northern line is an automated line, which means the train is controlled by a computer system that determines when the train starts and stops as opposed to red and green signals. However, delays during the peak hours indicated due to a fault or failure of the signaling system are as follows:

Year	AM	PM	Total
2015	50	26	76
2016	21	12	33
2017	11	8	19
2018	1	1	2

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

Eva Hextall

FOI Case Officer

FOI Case Management Team

General Counsel

Transport for London

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