Southern Rail are advising passengers to avoid travelling today as drivers begin more strike action.
Trains will be cancelled today, tomorrow and Friday - with severe disruption also expected on Thursday.
The strike is part of an ongoing dispute over Southern's proposals to increase its use of driver-only trains.
Train services will not be stopping at some stations.
There will be no Southeastern services at Charring Cross, Waterloo, Waterloo East, Cannon Street or London Bridge stations until August 29. Instead, trains will be diverted to Victoria, Blackfriars and New Cross.
Meanwhile buses will replace trains at Deptford, Greenwich, Maze Hill and Westcombe Park stations.
From August 29 to September 1, there will be no Southeastern services at Cannon Street, with trains instead diverted to Victoria, Blackfriars and New Cross.
Buses will replace trains at Deptford, Greenwich, Maze Hill and Westcombe Park stations.
The disruption is due to the continuing Thameslink programme work, which will see the new concourse at London Bridge open on August 29.
The new routes will launch this Friday to coincide with the launch of the Night TubeRead the full story ›
Thirty railway stations in London are launching a new scheme to help disabled passengers.
The six-month trial, called 'Turn Up and Go', aims to help people who need assistance without them having to book ahead.
Currently support needs to be organised 24 hours before travelling.
"Many disabled Londoners already go by rail without booking assistance but we know that many more would like the extra confidence that catching a train can be a spontaneous decision for them.
Rail services are now far more accessible than ever, and we are committed to continuing to make travel by train an attractive prospect for disabled people."
Londoners are being warned to expect transport delays over the Easter break, with roads jammed and some rail services shut down.Read the full story ›
Anyone for London Waterlove? Or how about Cupid Junction?
Passengers in London have been spotting some strange stations popping up on departure boards today - all in the name of getting into the Valentines spirit.
London Waterloo has been given the more romantic title of London Waterloo, while Clapham Junction becomes Cupid Junction for the day.
Have you spotted any others? Tweet us a picture @itvlondon
A second day of diversions will be in place on the M20 this morning due to problems at the Channel Tunnel.
Non-freight traffic travelling in the direction of Folkestone and Dover will be diverted onto the A20 from Junction 8 (Hollingbourne) and rejoin the motorway at Junction 9 (Ashford West).
This allows backed-up freight traffic to park on the coast-bound carriageway.
Kent Police say drivers should leave more time or find alternative routes as 'Operation Stack' continues.
What is Operation Stack?
Operation Stack is where parts of the M20 are used to queue lorries travelling towards the continent, to avoid causing gridlock across Kent's road network.
It is introduced as an emergency measure.
The disruption at London Bridge Station is expected to last until the end of service tonight, National Rail have said.