FOI request detail

Tunnel coverage on London Underground

Request ID: FOI-0525-2324
Date published: 26 June 2023

You asked

Inspired by the Tube map showing tunnels, I would like to know how much of each line on the London Underground is covered by tunnels. The figures could be given as a percentage of the entire line, for example, Victoria - 100% or the length in km.

We answered

TfL Ref: 0525-2324

Thank you for your request received by Transport for London (TfL) on 21 May 2023 asking for information about our Tube lines.
 
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: Inspired by the Tube map showing tunnels, I would like to know how much of each line on the London Underground is covered by tunnels. The figures could be given as a percentage of the entire line, for example, Victoria - 100% or the length in km.

Using GIS data that we hold, we have calculated what track sections are below ground and the totals for each of our Tube lines as below.

Note:-
  • values are calculated per road  e.g. EastBound & WestBound or NorthBound & SouthBound, not in one direction.
  • excluded - sidings, depots, spurs
  • circle line falls under district and hammersmith
  • NR refers to parts of the track operated by Network Rail
 
TOTAL_BELOW_LENGTH_M TOTAL_LENGTH_M PERCENTAGE LINE
23772 24028.1 98.9 BAKERLOO
0 24908.6 0 BAKERLOO (NR)
53190.5 152228.5 34.9 CENTRAL
39933.5 128298.7 31.1 DISTRICT
0 8916.9 0 DISTRICT (NR)
19235.3 30177.2 63.7 HAMMERSMITH & CITY
42124.9 80435.3 52.4 JUBILEE
7731.9 156275 4.9 METROPOLITAN
90391 129272.1 69.9 NORTHERN
61022.9 131849 46.3 PICCADILLY
46936 46936 100 VICTORIA
4687 4687 100 WATERLOO & CITY


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


Sara Thomas
FOI Case Management Team
General Counsel
Transport for London

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