The U.S. Surface Transportation Board, which replaced the Interstate Commerce Commission,  ordered Canadian Pacific Railway and BNSF Railway to provide updates by Friday on how they plan to obtain more grain cars to help farmers get their crops to market this fall, reported The rail system in much of the western Corn Belt has been slowed by a plentiful 2013 harvest and higher coal and oil volumes. Severe weather last winter also reduced the size and speed of trains that operated.