PORTLAND, Ore. (AP) — Two railroads disclosed Thursday that they ran a total of three oil car trains a week through Oregon's most populous county.

The documents also show the rail lines are capable of moving nine trains a day through the region.

The records show how much crude oil from the Bakken region of North Dakota, Montana and parts of Canada was carried by train car through Oregon.

The records were released after a month-long battle over the records between media outlets that requested them and Oregon public officials, who said the material was protected by federal law.

The records were provided to the U.S. Department of Transportation after the agency issued an emergency order requiring railroads to notify state officials about the volume, frequency and county-by-county routes of trains.