Tube workers to strike on polling day London Underground’s Central Line to be hit by a strike on polling day (Victoria Jones/PA) London Underground workers are to strike on polling day over the dismissal of a colleague. Members of the Rail, Maritime and Transport union (RMT) on the Central Line will walk out for 24 hours from 9pm on May 5 to 9pm on May 6, when elections are being held, including for the capital’s mayor. The union claimed RMT rep Gary Carney had been unfairly sacked. RMT general secretary Mick Cash said: “The sacking of Gary Carney is a blatant case of victimisation for trade union activities and his colleagues have made it clear that they stand shoulder to shoulder with him in this fight for justice.