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