I would like to request the following information about the Southbound Northern Line (High Barnet Branch) between 1st June and 18th July 2019 (inclusive): - All service affecting failures by date/time and type - In the case of signal failures, the origin and/or cause - The average time between trains (versus any such target) - The longest time between trains during any period advertised as "good service"

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TfL Ref: FOI-1153-1920

Thank you for your email of 18^th July 2019 asking for information about the service on the southbound Northern Line.

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

Specifically you asked:

I would like to request the following information about the Southbound Northern Line (High Barnet Branch) between 1st June and 18th July 2019 (inclusive):

- All service affecting failures by date/time and type

- In the case of signal failures, the origin and/or cause

- The average time between trains (versus any such target)

- The longest time between trains during any period advertised as "good service"

I can confirm that we hold the information you require.

The answers to your first three questions are shown in the attached spreadsheet (note that you may need to expand the width of some colums to see the information in full).

In answer to the fourth question, please see the attached pdf document which provides the service status definitions for the Northern Line. 

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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