Wimbledon branch delay data

TfL used to measure the impact of delays using a metric called Lost Customer Hours — estimating the total time lost by passengers due to disruptions of two minutes or more. However, TfL stopped publishing this data after 2019/20, citing COVID changes to passenger demand. They have never resumed it.

With no official measure of real-world delay impact, this community tracker fills the gap. The "time lost" figures above use a similar principle — multiplying delay duration by the number of affected passengers — to produce evidence we can present to our MP, TfL, and the Department for Transport.

Source: TfL Underground Services Performance

This project documents the real passenger experience on the Wimbledon branch and compares it against TfL's official status reports. We aim to demonstrate that TfL frequently reports "Good Service" while passengers experience significant delays — and use that evidence to push for investment.