London Underground recalled all 50 new trains on the Central Line, after a fault with the brakes was found. LU continued using the trains, but denied putting passengers at risk.

The trains were back in service yesterday. The fault was discovered when a driver overshot Leyton station after applying too much pressure to the control lever. This opened the supply of compressed air and released the brakes.

A spokesman said: 'At no time were passengers at risk. If too much pressure is applied then the driver can re-engage the brakes in a split second.'

More rush hour trains were promised by LU yesterday. The changes mean more District Line trains to Wimbledon from Edgware Road, and more Piccadilly and Circle Line trains. Six extra trains an hour will run to and from Uxbridge on the Metropolitan Line, off peak. The new timetable starts on 29 May.