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LONDON — According to a wire service, two rail unions on Monday called a series of 24-hour strikes that will hit travelers on three days this week, including the long August holiday weekend.

In a long-running pay dispute, members of the Rail Maritime and Transport union on Arriva Trains Northern say they will walk out for 24 hours on Wednesday and again on Saturday, disrupting services across Northern England.

Members of the RMT and the Transport Salaried Staffs Association who are employed as retail staff by Arriva Trains Northern will strike Friday and Saturday in a separate pay dispute.

Municipal workers — who held a national strike last month — are also planning another job action in late September. The union said council workers in London will strike to support their demand for a higher cost of living allowance for workers in the capital. No date was set.

The Association of London Government said striking would not find what it called the “missing millions” needed to meet the pay demand.

Britain has been hit be a series of strikes in recent months.

Last week, northern England rail passengers on First North Western railway were left stranded by a 48-hour walkout over pay, by members of the train drivers’ union Aslef, which plans two more strikes, Aug. 27-28 and Sept. 10-11.

The union had called off the series of strikes earlier this month but reinstated them last week after accusing First North Western, which runs local trains across northwest England, of changing an agreement reached on pay.