Oregon Revised Statutes Oregon Vehicle Code § 824.084

Each railcar containing hazardous materials for which an “Explosives A,” “Flammable Gas” or “Poison Gas” placard is required by federal regulation, and which remains in a rail yard or station for more than two hours shall be visually inspected externally by the transporting railroad within two hours of the car's arrival and within two hours prior to the car's departure.