Northern Line

MQT on 2006-11-18
Session date: 
November 18, 2006
Question By: 
Brian Coleman
GLA Conservatives
Asked Of: 
The Mayor


How many signal failures and multiple signal failures there have been on the Northern Line during the two most recent periods (covering September and October 2006)?


Answer for Northern Line

Answer for Northern Line

Answered By: 
The Mayor

London Underground (LU) compiles its performance statistics on the basis of 4-week periods rather than calendar months. The most recent period for which results are available is LU period 6 (20 August ' 16 September 2006) when there were 27 failures.

This is the number of signal failures that were attributable to Infraco and that resulted in service disruptions of 2 minutes or more. A single incident that causes more than one signal to fail is counted as 1 in the total.