Underground services performance

Most of our regular performance figures are updated every four weeks - defined as a period - and show a range of service and network-related matters.  Guidance notes have been included for each key performance metric which provide further details.

Latest performance figures

Period 3 - 2021/22 (from 30 May 2021 - 26 June 2021)

Service Operated % - Weekday 92.5%  
Service Operated % - Weekend 85.5%  
Kilometres Operated 5,915,812  

Service Operated %

Service Operated compares the actual number of train trips versus the scheduled number of train trips over time using a predetermined set of measuring points.

Kilometres Operated

Kilometres operated is a measure of how far trains have run on the London Underground network compared to the scheduled working timetables.

Excess Journey Time

Excess Journey Time is the difference between Actual Journey Time and Scheduled Journey Time, expressed in decimal minutes.  Any deviation from the schedule will result in Excess Journey Time.

Note: The Excess Journey Time metric is available up until 2019/20 period 12.  This is because the modelling assumes a certain level of passenger demand.  Since March 2020 these assumptions have not been accurate due to the much reduced passenger numbers following the coronavirus response.

Lost Customer Hours

Lost Customer Hours is used to measure the customer experience of reliability on the London Underground network.  The system estimates the impact of any service disruption of two minutes or more in terms of time lost by our customers.

Note: The Lost Customer Hours metric is available up until 2019/20 period 12.  This is because the modelling assumes a certain level of passenger demand.  Since March 2020 these assumptions have not been accurate due to the much reduced passenger numbers following the coronavirus response.