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Workers at one of the country's biggest train companies are to take industrial action during the Olympics in a row over a Games bonus payment.
Up to 1,000 members of the RMT union at South West Trains will work to rule with a ban on overtime throughout the Games.
South West Trains insists it has already agreed a wage deal covering the Games period.
Union members working on the London bike hire scheme will strike for 48 hours from Friday morning in a similar row.