OMAHA, Neb. (AP) — A backlog of grain shipments across the Great Plains has been reduced but not eliminated, so U.S. regulators are requiring BNSF and Canadian Pacific railroads to provide weekly updates on their efforts to catch up before harvest.

The U.S. Surface Transportation Board told BNSF and Canadian Pacific to submit plans to address the backlog by this Friday and begin filing weekly updates. The updates are similar to those regulators required on fertilizer shipments this spring after farm groups complained.