A number of routes in and out of London train stations are affected by the 48-hour Southern Rail strike.
Guards began their latest strike on Wednesday, with only one in three services running on the rail operator's network until midnight on Thursday (September 8).
The strike action is due to a dispute over the role of guards and conductors and 'driver-only' trains, which are described by the RMT union as dangerous for passengers.
They have pointed to an example of a woman being dragged along a platform after her bag got caught in a train door at Hayes and Harlington station last year.
What routes are affected?
Here are the routes (map below) affected by the strike including those with no service and a limited service.
There will be no Southern service between Clapham Junction to Milton Keynes via Kensington Olympia, however passengers can use the London Overground or London Midland as an alternative.
A limited service will operate between London Victoria to Gatwick Airport and Brighton as well as London Bridge to East Grinstead via East Croydon.
A five-day strike planned for earlier this month was called off half way through after talks resumed.
Watch Southern Rail staff during five-day strike action
Where else can Southern Rail service tickets be used?
Southern tickets will be accepted on other train operators' services including the London Underground , London Midland, South West Trains, Southeastern and London Overground.
London Midland will accept tickets for travel between London Euston and Milton Keynes Central
London Overground will accept tickets between:
- West Croydon / Crystal Palace and New Cross Gate / Canada Water
- London Euston and Watford Junction
- Peckham Rye and Canada Water
- Clapham Junction and Watford Junction via Willesden Junction
London Underground will accept Southern tickets for services for transfer between London Bridge, Blackfriars, Victoria, Euston, Canada Water, and Balham, but passengers arriving at Waterloo will need to travel via Clapham Junction to Victoria.
Southeastern will NOT accept tickets on high speed services but on normal services between Hastings and London via Tonbridge and Ashford International and London.
Southern Rail has said on its website: "The strike action will have a significant effect on Southern services on the whole of the days affected, with no service on many routes and only a limited service between approximately 7.30am and 6pm on others, though we will extend the services hours if we are able."