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Commuters are facing up to five days of disruption as union members at three train firms plan fresh strikes in a dispute over the role of guards.

Strikes by workers at operators Northern, Greater Anglia and South Western Railway (SWR) are set to take place on 9 May, the Rail, Maritime and Transport (RMT) union said.

SWR staff are also planning four 24-hour strikes on 11, 14, 16 and 18 May.

The Department for Transport said the industrial action was "pointless".

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The RMT has said changing the role of guards and extending driver-only services would compromise staff and passenger safety, which the government denies.

The union held a protest opposite Parliament earlier, marking two years after the dispute began on Southern Railway.