FOI request detail

Freedom of Information request - Minor delays due to train cancellations

Request ID: FOI-2981-2223
Date published: 28 February 2023

You asked
Dear Transport for London, Please can you tell me the how many days in the last 12 months there have been "Minor delays due to train cancellations" on the Jubilee Line in the TFL app? Please can you tell me the periods of time since 1st January 2023 that have been classed as "Minor delays due to train cancellations" on the Jubilee Line on th TFL app? Please can you also provide a non-exhaustive list of some of the reasons for minor delays caused by train cancellations on the Jubilee?

We answered

TfL Ref: 2981-2223

Thank you for your request received by Transport for London (TfL) on 9 February 2023 asking for information about London Underground’s Jubilee line service.

Your request has been considered in accordance with the requirements of the Freedom of Information (FOI) Act and our information access policy.  I can confirm we hold some of the information you require. You asked:

how many days in the last 12 months there have been "Minor delays due to train cancellations" on the Jubilee Line in the TFL app?

Please can you tell me the periods of time since 1st January 2023 that have been classed as "Minor delays due to train cancellations" on the Jubilee Line on the TFL app?

We are unable to report on the specific information you have requested as reliability on the London Underground is measured differently. However information that will be of interest to you can be found at the following link: https://tfl.gov.uk/corporate/publications-and-reports/underground-services-performance

‘Service Operated’ compares the actual number of train trips versus the scheduled number of train trips over time using a predetermined set of measuring points and is the main London Underground measure for reliability. This is available by line and period, and goes back to 2018/19.

Please can you also provide a non-exhaustive list of some of the reasons for minor delays caused by train cancellations on the Jubilee?

Please see the following snapshot of such cancellations which have been recorded on the Jubilee line:

Defective in Depot.

Customer Action.

No Train Operator.

Signal System Failure.

Defective in Service.

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



Jasmine Howard
FOI Case Officer
FOI Case Management Team
General Counsel
Transport for London

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