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London Underground are taking legal action to try to stop tube drivers striking on Boxing Day
Union Aslef says its Tube members will walk out for 24 hours on December 26 with further walkouts on January 16 and February 3 and 13.
It's after failing to agree payments for working on Boxing Day.
Around 2,200 Aslef members were balloted, with 92% of those who voted backing a campaign of industrial action.