The RMT union has announced that Tube drivers on the Piccadilly Line will strike in a row over working conditions.
Tube cleaners and some engineers working for Transport for London will also walk out in separate disputes.
Drivers on Tube lines serving the Hammersmith and City, Metropolitan and Circle Lines voted for industrial action, short of a strike.
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This is Gordon Hill. But you may know him by now as the Wealdstone Raider.