Thank you very much for the information attached below [case ref FOI-1077-1920]. I was also wondering whether you keep data regarding the status of the tube network. For example, for the month of August, do you keep records of the status of tube lines for, let's say, every hour.

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TfL Ref: FOI-1719-1920

Thank you for your further email of 6^th September 2019 asking for information about the performance status of London Underground lines.  

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 was also wondering whether you keep data regarding the status of the tube network. For example, for the month of August, do you keep records of the status of tube lines for, let's say, every hour.”

TFL does not hold the exact information requested. However, the document attached shows the percentage of each day during August where a line displayed ‘good service’. There are notes provided within the document to explain the times when the data was collected.

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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