A spokesman for Union Pacific Railroad says the company’s rail fastening system has an outstanding safety history.

Spokesman Justin Jacobs’ statement was in response to the Federal Railroad Administration’s preliminary report on a June 3 fiery oil train derailment in the town of Mosier, Oregon. The report blamed Union Pacific for not properly maintaining its tracks and missing problems with bolts that fasten the rail ties to the rails.

Jacobs says the company will replace all the lag bolts with rail spikes, which will make problems easier to detect on inspections.

He also says an upgraded braking system called for by the Federal Railroad Administration wouldn’t have made a difference in the severity of the derailment.