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LONDON — A wire service reports that train engineers in northwestern England began a 48-hour walkout Tuesday in a dispute over pay, prompting the cancellation of dozens of services across the region.

The drivers, who work for train operator First North Western, have rejected a 19 percent pay raise because of conditions attached to the offer.

The drivers’ union Aslef said “new and unacceptable” conditions included making drivers responsible for picking up litter at stations. The company said the union had reneged on an agreement.

The strike is the second in a trio of planned walkouts. The third is scheduled for Sept. 10 and 11.

First North Western travels to and from northwestern cities including Manchester, Liverpool and Blackpool.

Over the last year, Britain’s privatized rail system has been hit by a series of short, localized strikes over pay and safety.