A fresh wave of industrial action will be launched by rail workers on Friday amid bitter disputes over the role of guards.
Members of the Rail, Maritime and Transport union (RMT) on South Western Railway (SWR) will refuse to work any rest days for the next four days.
The union said the action will have a "serious impact", although the company said it planned to run all its services.
The union is embroiled in long-running disputes over staffing and the role of guards on trains with five separate operators which have led to a series of strikes and other forms of industrial action.
SWR, which runs services across Southern England, including busy commuter routes to London Waterloo, said it planned to run a normal service over the next four days but advised passengers to check before they travel.
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