Train delays at the UK’s busiest railway station were expected to last until the end of the day following its reopening after engineering works.
Ten of the platforms at London’s Waterloo were shut for almost a month for an £800m project to boost capacity.
The platforms came back into use on Tuesday but Network Rail testing then identified a signalling issue.
One of the companies affected, South Western Railway, said there would be delays of at least 10 minutes.
Buses were replacing trains on the Shepperton, Hampton Court and Chessington South branches and between Weybridge and Virginia Water.
Some stations on routes to Waterloo were closed this morning and there were more problems caused by a broken-down freight train between Eastleigh and Southampton, while a broken-down train between Leatherhead and Effingham Junction in Surrey blocked lines.
Network Rail said Waterloo had fully reopened following one of the “largest and most complex” upgrades in the station’s history.
A spokeswoman said a 1,000-strong team of engineers and trackside staff had been working 24 hours a day for the past three-and-a-half weeks to complete the work, which would boost capacity at the station by 30% by December 2018, providing space for another 45,000 passengers at morning and evening peaks.
Becky Lumlock, route managing director at Network Rail, apologised to passengers for the delay and thanked them for their patience.
She said: “The work we have completed in three-and-a-half weeks this August will…