The repairs will begin on Sunday (May 18) and will see several trains cancelled.
Other Southeastern trains will be cancelled throughout the weekend.
We have broken down the details so you can plan ahead this weekend.
Sunday (May 18):
Engineering work on the Blackheath Tunnel is set to begin on Sunday.
As a result, no trains will run between Blackheath and Charlton.
Most trains between Dartford and London Cannon Street via Woolwich Arsenal and Lewisham will be diverted to run via Greenwich, however, at peak times some of these trains will be diverted to run via Bexleyheath.
There will be two trains per hour between Blackheath and London Cannon Street.
At peak times some additional trains will run between Dartford and London Cannon Street via Bexleyheath.
Saturday (May 17):
Engineering work is taking place at London Victoria, closing all lines used by Southeastern.
Trains will be diverted to London Cannon Street or London Blackfriars.
Sole Street Line: Trains between London Victoria and Ramsgate via Chatham will run from London Cannon Street instead and run non-stop between London Bridge and Longfield.
Trains between London Victoria and Dover Priory via Chatham will run from London Cannon Street instead and run non-stop between London Bridge and Bromley South.
Stopping services which usually only run between London Victoria and Gillingham will not run.
Maidstone East Line: Trains between London Victoria and Ashford International via Maidstone East will run from London Charing Cross and run non-stop between London Bridge and St Mary Cray.
Bromley South Line: Trains between London Victoria and Orpington will run from London Blackfriars, calling additionally at Elephant & Castle.
Brixton station will be closed all day.
Bexleyheath Line: Trains between London Victoria and Gravesend via Bexleyheath will not run.
Additional trains will run between London Charing Cross and Dartford via Bexleyheath.
Additional trains will run between London Blackfriars and Orpington via Denmark Hill and Lewisham.
