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Data from the software provider Freightos shows average vessel arrival in December was 5.2 days late at West Coast ports, compared to 1.7 days in September.
The Occupational Safety and Health Administration said a "culture of retaliation" against whistleblowers is pervasive at Union Pacific Railroad.
The revised agreement would allow collaboration on congestion, transportation infrastructure needs and pollution mitigation.
Election proceeded despite the request for a restraining order.
January 2015 totals for U.S.-North American Free Trade were higher than the previous year for rail, truck and air transportation, according to figures from the Department of Transportation’s Bureau of Transportation Statistics.
Officials say the worst back ups have been alleviated, but challenges remain as countermeasures continue to be implemented.