Rail workers embroiled in the bitter disputes over the role of guards are to take fresh industrial action.
Members of the RMT union will walk out on Monday, Wednesday and Friday on South Western Railway over train guards dispute.
South Western Railway will be introducing longer trains and extra seats during their peak time services today, Monday 11 December until early 2018.
The rail operator says 100 additional carriages will be available, carrying up to 5,000 more passengers on its busiest routes.
The existing trains will be used for other services.
Passengers travelling on their trains are now also able to claim compensation for a journey delay of 15 minutes or more, changing from the previous 30-minute threshold.
As staff at South Western Railway take on strike for 48 hours, passengers are facing major delays during the peak time travel period.
South Western Railway has announced that it will run more than 60% of its normal services on the two days that the RMT union are striking.
Rail services in parts of the region face disruption after South Western Railway staff voted in favour of strike action.
Members of the RMT union have agreed to walk out in a dispute over the role of guards on train services.
South Western Railway took over from South West Trains in August.
A date for the strike has not yet been fixed.
The launch of the new South Western Railway brand and liveried train follows the completion of the August Waterloo station upgrade works.