Station staff working for the rail operator Greater Anglia have voted to go on strike in a row over flexible working.
Members of the Rail Maritime and Transport Union on the West Anglia route backed a campaign of industrial action.
The union has about 100 members involved in the dispute. Its General Secretary Bob Crow has accused Greater Anglia of ignoring agreed procedures.
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Saturday will be largely cloudy with a continued risk of heavy showers or thunderstorms. Sunday will be dry with sunny spells.
There continues to be a risk of thunder tonight and tomorrow but the weather will become drier and clearer by sunday.