Members of the Transport Salaried Staffs Association (TSSA) on the Elizabeth line will strike on May 24 - the date last year that the first train ran in the new tunnels from Paddington to Abbey Wood.
In a turnout of nearly 90 per cent, members voted by 76 per cent to 24 per cent in favour, signalling an end to the bitter row, which led to a series of strikes in recent months.
Members of the Transport Salaried Staffs Association (TSSA) have voted to accept offers by train companies in the long-running dispute over pay, job security and conditions.