Northern Line

MQT on 2007-01-30
Session date: 
January 30, 2007
Question By: 
Brian Coleman
GLA Conservatives
Asked Of: 
The Mayor


Can you provide figures for excess journey time for the Northern Line, in proportional percentage due to: A - Infraco action, B - London Underground action, and C - other /passenger action, for the two most recent periods (covering December 2006 and January 2007)?


Answer for Northern Line

Answer for Northern Line

Answered By: 
The Mayor

London Underground (LU) compiles its performance statistics on a 4-week period rather than calendar months. The breakdown of excess journey time figures for the two most recent periods (Periods 9 & 10 2006/07) shows that the total excess journey time of 7 minutes on the Northern line is made up of 2 minutes due to stations-related functions, for example interchange and ticket purchase etc and 5 minutes due to train-related incidents. Demand for underground services during November & early December 2006 was the highest on record and this had a direct effect on excess journey times with higher levels of on-train crowding and increased dwell times leading to longer journeys.The train excess journey time of 5 minutes is broken down as follows:

· 4.2 minutes - Small incidents of less than 2 minutes duration each (e.g. fluctuations in demand, variations in service regularity and on-train crowding)

· 0.42 minutes - InfraCo related

· 0.21 minutes - LU-related (including staff absence and errors)

· 0.17 minutes - Customer related (e.g. security alerts or customer illness)