Northern Line

MQT on 2007-01-30
Session date: 
January 30, 2007
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 December 2006 and January 2007)?


Answer for Northern Line

Answer for Northern Line

Answered By: 
The Mayor

The most recent 4-week periods for which results are available are period 9 (12 November ' 9 December 2006) when there were 24 failures and period 10 (10 December 2006 ' 6 January 2007) when there were 25 failures. These are the numbers 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.