FILE - In this Sept. 7, 2011, file photo, union workers block a train headed to a port grain terminal in Longview, Wash. Dockworkers were given the chance Friday, April 28, 2017, to vote on a new contract extension that could provide long-term labor peace at West Coast seaports, where in recent years work slowdowns and strikes have affected billions of dollars in cargo. (AP Photo/Don Ryan, file)
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