Cannon Street repair cancellations affect thousands
Dozens of Southeastern trains have been cancelled as repairs are made to the track on a bridge over the river on the approach to Cannon Street Station.
All trains in and out of Cannon Street were cancelled from the start of Monday, affecting thousands of passengers.
A Network Rail spokesman said a loose contact plate had been found under a rail. He said it was not a major structural issue.
Passengers have complained on Twitter.
Marisa Kacary said: "Seriously overcrowded train and long delays. Not a good start to the week. Sort it out #southeastern trains."
Caz Caddick tweeted: "@Se_Railway thank you once again for making me late for work. It's not like I have a job to keep or anything! #southeastern."
There were about 59 cancellations said SouthEastern, causing major disruption.
After 08:00 GMT, some trains were being diverted to London Victoria and Blackfriars.
Network Rail said a dip at track level had been found on a routine bridge inspection.
National Rail Enquiries said there was no firm estimate of how long disruption would last but it was likely to continue until at least 14:00 GMT.