Workers on Greater Anglia trains will go on strike next month as the row over the role of guards continues.
The news was announced as the RMT Union staged a national protest outside Parliament on Wednesday - on the second anniversary of the rail disputes.
The Union says it's to defend the role of guards on trains and passenger safety.
"Yet again the intransigence of private rail companies operating in England over the key issue of the guard guarantee means that we have no option but to announce further strike action in the separate disputes on Arriva Rail North, Greater Anglia and South Western Railway," RMT general secretary Mick Cash said.
"With RMT members protesting outside Parliament today we are drawing attention to the ludicrous situation that means we are able to reach agreements in Wales and Scotland on the guard guarantee but not on a raft of key franchises in England."
Greater Anglia staff will strike for 24 hours on May 9.
But Greater Anglia say it wants its conductors to concentrate on customer service, rather than opening and closing doors.