With rail network congestion improving in some of the nation’s grain belt, Union Pacific Railroad and BNSF Railway are facing another prospective headache: a shutdown of the port complex of Los Angeles and Long Beach, the country’s largest.

Omaha-based Union Pacific Railroad says a work slowdown by the the International Longshore and Warehouse Union on the California waterfront is hurting international volumes of cargo containers that travel by ship, rail and truck.

BNSF Railway, owned by Omaha’s Berkshire Hathaway Inc., said the labor dispute needs to get resolved before the economy begins to register damage.

Read the complete story at Omaha.com.