North Dakota's congressional delegation is pressing Canadian Pacific Railway to provide specifics on its backlog of grain shipments.
The U.S. Surface Transportation Board told Canadian Pacific and BNSF Railway in June to submit plans to address backlogs in northern Plains states and begin filing weekly updates.
But the state's congressional delegation says Canadian Pacific's weekly report does not include a specific number of past-due rail cars or average lateness.
The railroad did not immediately return telephone calls to The Associated Press on Tuesday.
BNSF Railway reported 3,908 past due rail cars in North Dakota averaging 26 days late. That's down about 14 percent from the previous week.
BNSF says North Dakota had the most past-due rail cars followed by Montana, South Dakota and Minnesota.