The Bakerloo line had the worst performance of any Tube line over the last four months.
Transport for London (TfL) data shows that only 85 per cent of scheduled Bakerloo line services actually ran as planned.
Between June 22 and July 19, the most recent time period for which figures have been released, this percentage was even lower, standing at just over 80 per cent.
The Bakerloo line currently uses trains that first entered service 53-year-ago, making them the oldest in regular passenger operation in the UK.
TfL wants to replace the existing fleet of 36 trains. The new models would boast walk-through, air-conditioned carriages.
The existing rolling stock is almost 20 years beyond its design life, and passengers have complained of “widespread” graffiti in recent months.
Three other lines – the Jubilee, the Metropolitan and the Central – also had fewer than 90 per cent of services running as planned.
The Northern line had the best performance since April, with around 93 per cent of scheduled trains operating as scheduled.
However, over the most recent four weeks for which data is available, the Victoria line was able to run the fullest service.
TfL says that scheduled services are based on current working timetables, so factors in adjustments for planned closures, weekend engineering works, and timetable notices.
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