Depth of tube stations and tube lines

The request was partially successful.

Dear Transport for London,

Under the Freedom of Information Act 2000, I would appreciate it if you can provide me with a spreadsheet containing information regarding the geographic location and depth of the London Tube lines in operation today.

Specifically, I would like the x and y (or latitude and longitude)of each station and their depths below mean sea level.

Also, if this information is available, I would like the x and y (or latitude and longitude)of the tube tunnels themselves along with their depths.

The reason for this is out of self interest, as I am trying to make a scaled geological model of the ground beneath london, and information as to the location and depth of the tube lines will add interest to the model.

Yours faithfully,
H. Madhoo

FOI, Transport for London

Dear Mr Madhoo

TfL Ref: 1700-1213

Thank you for your email received by Transport for London (TfL) on 9 January 2013.

Your request will be processed in accordance with the requirements of the Freedom of Information Act and TfL’s information access policy.

A response will be provided to you by 6 February 2013.

In the meantime, if you would like to discuss this matter further, please do not hesitate to contact me.

Yours sincerely

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

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FOI, Transport for London

1 Attachment

Dear Mr Madhoo

TfL Ref: 1700-1213

Thank you for your email received by Transport for London (TfL) on 9 January 2013.

Your request has been considered in accordance with the requirements of the Freedom of Information (FOI) Act and TfL’s information access policy.

Because we are in the process of finalising our response we will not be able to resolve your request within the statutory 20 working day.

We intend to provide you with a full response as soon as possible. Please accept my apologies for this delay.

In the meantime, if you have any queries relating to your request, please do not hesitate to contact me.

Please see the attached information sheet for details of your right to appeal.

Yours sincerely

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

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FOI, Transport for London

5 Attachments

Dear H Madhoo

 

TfL Ref: 1700-1213

 

Thank you for your email received by Transport for London (TfL) on 9
January 2013 asking for information about the geographic location and
depth of the London Tube lines in operation today. Please accept my
apologies for the delay in responding.

 

Your request has been considered in accordance with the requirements of
the Freedom of Information (FOI) Act and TfL’s information access policy. 
I can confirm TfL holds some of the information you require. You asked
for:

 

A spreadsheet containing information regarding the geographic location and
depth of the London Tube lines in operation today.

    

Specifically, I would like the x and y (or latitude and longitude)of each
station and their depths below mean sea level.

    

Attached is the requested data. Please note that the crossed out stations
are those belonging to the London Overground network that was previously
served by the East London Line, which was part of the London Underground.

 

Also attached are two maps that provide a reasonable representation of the
routes followed by the tunnels in two dimensions. Included is an index to
these and a sample the sheet showing Central London; further maps in this
series are available upon request.

 

Also, if this information is available, I would like the x and y (or
latitude and longitude) of the tube tunnels themselves along with their
depths.

 

In accordance with the FOI Act TfL is not obliged to supply some of the
information as it is subject to a statutory exemption to the right of
access to information under Section 38’s Health and Safety exemption.

 

In this instance the exemption has been applied as disclosure of the
information you have requested is not available in, nor readily
transferrable to the format requested as the horizontal and vertical
alignments of the tunnels between stations is a series of very complex
three dimensional lines. Unlike stations, which can be pinpointed to a
specific geographical location, a tunnel winds, dips and rises between one
station and another. Therefore, any single point in a tunnel will have its
own latitude, longitude and depth.

 

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 cause harm or disruption
to the London Underground network. An example of the security implications
to consider is that it could identify relative levels and locations of
tunnels enabling more effective terrorist attacks of various natures on
the deep level London Underground network.

 

The use of this exemption is subject to an assessment of the public
interest in relation to the disclosure of the information concerned.  TfL
recognises the need for openness and transparency by public authorities,
but in this instance the public interest in applying the exemption, in
order to minimise the potential risks of identifying locations for
targeted terrorist attacks and to maintain the safety and welfare of staff
and members of the general public, outweighs the public interest in
disclosure.

 

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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