Signal Failures on Sub-Surface Tube Lines

Meeting: 
MQT on 2015-11-18
Session date: 
November 18, 2015
Reference: 
2015/3865
Question By: 
Murad Qureshi
Organisation: 
Labour Group
Asked Of: 
The Mayor
Category: 

Question

Can you please give me figures for all signal failures on sub-surface tube lines (Hammersmith and City, Circle, District, and Metropolitan lines) annually for the past 5 years?

Answer

Answer for Signal Failures on Sub-Surface Tube Lines

Answer for Signal Failures on Sub-Surface Tube Lines

Answered By: 
The Mayor

The below table provides the number of signal failure incidents by sub-surface rail Tube line for each of the past five years.

Year

Hammersmith & City / Circle line signal failures

District line signal failures

Metropolitan line signal failures

Total lost customer hours per year

2010/11

178

405

441

9.3 million

2011/12

184

458

435

6.6 million

2012/13

162

473

330

6.4 million

2013/14

197

504

283

5.8 million

2014/15

214

575

342

5.5 million

While the number of incidents varies each year, the overall impact felt by customers has fallen in recent years due to London Underground's hard work to improve the reliability of the Tube.

The number of 'total lost customer hours' - how TfL measures the actual delays experienced by its customers - on the four lines fell by 41 per cent over this period, despite rapidly growing passenger numbers putting increased pressure on the Tube network. TfL has delivered this through a relentless focus on reliability by management, smarter approaches to maintenance and a better response to incidents such as signal failures to minimise their impact. The number of 'total lost customer hours' for these four lines combined is provided in the above table.

Delays will be reduced further by the Four Line Modernisation programme, which will introduce modern computerised signalling technology on these lines similar to that which has delivered vast improvements to the Victoria, Jubilee and Northern lines. This technology will also allow increases in the frequency of trains to carry more people, accommodating and enabling London's rapid growth.