Minister of Agriculture Gerry Ritz threatens railroads with regulations to clear the grain-shipping backlog, which he partly blames on increased crude oil shipments.

The railroads deny the backlog is due to crude oil, arguing it is the result of an extremely cold winter and a massive grain crop.

The Wall Street Journal interviewed Professor James Vercammen, whose research focuses on economic issues in the agriculture industry.

"Ottawa could impose financial penalties against railroads if they don't meet quotas for hauling grain," says Vercammen. "But railroads will probably pass on such costs to grain companies."

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