The Waterloo and City Line connects Waterloo railway station with Bank in the City of London. With two stations and no stops in between, it is the most efficient line on the network in terms of time lost through disruption.
Transport for London measures delays in what it calls Lost Customer Hours (LCH). These are calculated by multiplying the delays in minutes by the number of passengers. TfL records all delays over 2 minutes. It uses the financial year from April to March and splits the year in 13 equal periods for performance measurement.
Data in the London Underground Performance Almanac for the last full year shows there was an average of 12,314 Lost Customer Hours per period on the Waterloo and City Line. This is the best performance on the network.
As the chart shows, with few other issues to contend with, isolated strike action is responsible for a very high proportion of the lost hours.
The Waterloo and City Line is the shortest line travelling 1.47 miles in 4 minutes. It carries fewer passengers than any other Tube line. It was known by its passengers as “The Drain”, possible due to the seepage of water into the tunnels.