1st October Tube delays (3)

MQT on 2014-10-22
Session date: 
October 22, 2014
Question By: 
Valerie Shawcross
Labour Group
Asked Of: 
The Mayor


How many disruptions to the tube network in 2014 have been due to late running maintenance works?


Answer for 1st October Tube delays (3)

Answer for 1st October Tube delays (3)

Answered By: 
The Mayor

There have been 18 occasions so far in 2014/15 when planned overnight maintenance activity has extended into the start of passenger services.


I am glad to say that between 2010/11 and 2013/14 (the last full year of figures) the number of such occasions fell by 23 per cent.


As a proportion of all delays to customers these occasions account for around a tenth of one percent (0.11 per cent).


A number of measures are in place to reduce the occurrence of engineering overruns, including:


  • New technology which measures the condition of      track and rail to predict degradation of assets. This enables defects to      be removed in a planned manner without impacting on the railway.


  • Increased investment in rail grinding/milling      across the network to prevent more serious defects developing.


  • Smarter stock control to ensure sufficient tools      and parts are available to cover breakage and malfunction.


  • Thorough pre-work staff briefings to confirm      plans for the night, with checks throughout the night to ensure that work      is running to time.


Further reductions are expected as a result of an additional £10 million per year investment in London Underground’s maintenance programme from 2015/16. This extra investment will be used specifically to improve the condition of rails, reducing the potential for defects requiring urgent attention that may result in engineering overruns.