Our ref: FOI-2072-1920/GH

Thank you for your request received by Transport for London (TfL) on 4 December 2019 asking for information about service delays.

Your request has been considered under the requirements of the Freedom of Information Act 2000 and our information access policy. I can confirm that we do hold the information you require.

Please see the guidance provided in the two attached documents. The first provides the definitions of the service status messages. The second attachment shows the matrix we use to define which status should be used on specific London Underground lines at a given time.

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.

If you are not satisfied with this response please see the attached information sheet for details of your right to appeal.

Yours sincerely

Graham Hurt

FOI Case Officer

FOI Case Management Team

General Counsel

Transport for London