FOI request detail


Request ID: FOI-1735-2122
Date published: 03 December 2021

You asked

Hello, I would like the latest track bounds diagram including the new extension for the NLE as well as the drawings for the system between Kennington and Battersea

We answered

TfL Ref: 1735-2122

Thank you for your request received by us on 18 October and following clarification, 5 November 2021 asking for information about the Northern line extension (NLE).

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

the latest track bounds diagram including the new extension for the NLE as well as the drawings for the system between Kennington and Battersea

The trackbounds maps as displayed in the upload posted.

Please see following the track layouts for London Underground’s Northern line extension, which are relatively indicative of the street network in this vicinity:

as well as the signal diagrams and speed limits if possible

In accordance with the FOI Act, we are not obliged to supply the information for this part of your request as it is subject to statutory exemptions to the right of access to information, under Section 38 (1) (b) and Section 24 of the Act.

In this instance the exemption has been applied as disclosure of the information requested would be likely to adversely affect the safety and security of Transport for London (TfL) employees and members of the general public, as well as national security.

Disclosure of this information to you has to be regarded as a disclosure to ‘the public at large’. This information could potentially be obtained and utilised by individuals who may wish to use this detailed level technical information to cause disruption or harm to the various services referenced in your request.

Such disclosure could compromise security and safety preparedness on the rail networks of interest, placing members of the public and TfL staff at risk by highlighting areas on these networks which could be susceptible to being targeted. It is our concern that the release of details about the operating environment in particular, could be combined with other information already in the public domain to help plan an attack.

Whilst we make no suggestion that you would use the information for anything other than your own personal interest, the London Underground and rail systems are an attractive terrorist target for several reasons including its importance to London and the knock on effect to the nation’s economy if it is disrupted. In addition to the publicity gained from attacking an iconic transport system such as the Tube for example and its direct access to the capital’s financial hubs and the attractiveness of these rail systems for a mass casualty attack due to their open, mass transport nature.

The use of these exemptions is subject to an assessment of the public interest in relation to the disclosure of the information concerned. We recognise the need for openness and transparency by public authorities but in this instance the public interest in applying the exemption, in order to minimise risks to operational resilience, safe operation of both rail and Tube networks, the welfare of staff and members of the general public, outweighs the public interest in disclosure.

In applying this exemption we have taken into account the tribunal decision referred to in the following link:;%20Decision;%20EA.2012.0127.pdf

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

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

Back to top

Want to make a request?

We'll email you the response within 20 working days.

We'll publish the response online without disclosing any personal information.