Do you have any available data on a breakdown of reliability of trains & maintenance costs of London Underground rolling stock broken down by individual train? Please could this be broken down by year for the past 3 years. If costs by individual train data is not available then overall per line costs and reliability of trains record is acceptable. However this will have to include quantity of trains worked on in that period. Feel free to use train data available on the Rolling Stock asset list. The definition of reliability is a list of trains that have had faults or broken down and needed repairs during the 3 year period. This is to access the reliability of individual train stock. Thank you in advance

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TfL Ref: FOI-3074-1819

Thank you for your request received by TfL on 13^th February 2019 asking for information about the reliability and maintenance costs of Underground trains for the last 3 years.

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 some the information you require – although it is not held by indiviual train as asked for in the in the first part of your request. Rather, the information is held by line. The information is provided in the table below. Note that reliability is measured in “mean distance between failures” (MDBF), and the table also shows the number of corrective work orders carried out on the fleet (although note that for the Northern Line this work is outsourced to Alstom and TfL does not hold the information). The financial figures given are the values associated with running maintenance (level 1-3 maintenance and remedial works) - spend on enhancements or overhauls carried out during those years is not included.

	2016			2017			2018
Line/Fleet	Cost (£)	No. of work orders	MDBF (000’s km)	Cost (£)	No. of work orders	MDBF (000’s km)	Cost (£)	No. of work orders	MDBF (000’s km)
Bakerloo Fleet	10,518,767	3,458	11,241	12,764,727	3,558	10,138	11,137,947	3,740	9,712
Victoria Fleet	20,302,362	6,615	31,040	13,191,107	7,150	48,039	15,633,546	7,585	42,321
Central Fleet	43,700,743	21,725	8,893	38,376,511	18,179	8,787	35,952,920	20,994	8,530
District, Hammersmith and City Fleet	19,924,916	17,426	25,427	20,325,995	10,687	42,271	19,440,024	11,707	85,025
Jubilee Fleet	15,591,236	5,262	25,143	17,592,272	6,485	28,351	18,231,457	7,075	24,845
Metropolitan Fleet	34,760,205	7,020	31,859	36,722,554	4,932	41,727	34,072,393	5,428	36,102
Northern Fleet	36,107,366	-	36,989	38,112,716	-	38,200	44,007,581	-	33,648
Piccadilly Fleet	34,927,143	6,693	45,730	29,125,089	5,670	35,291	28,225,062	5,956	30,775

Note that through the Deep Tube Upgrade Programme 250 new trains for the Piccadilly, Bakerloo, Central and Waterloo & City lines will be provided, with the first new trains serving the Piccadilly line from 2024. More information about the Programme can be found on our website here: https://tfl.gov.uk/campaign/tube-improvements/what-we-are-doing/improving-the-trains

Specifically on the Central Line, TfL is investing £356 million as part of the Central Line Improvement Programme, which includes the replacement of old traction motors on the fleet to help reduce delays on the line. These improvements will be complete by 2024. In the longer term, TfL will replace the current 92' Stock train fleet with the next generation of trains as part of the Deep Tube Upgrade Programme referenced above.

If this is not the information you are looking for 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,

David Wells

FOI Case Officer

FOI Case Management Team

General Counsel

Transport for London

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