On July 2, just east of BNSF Railway Tunnel 5 in Skamania County, a blaze eventually designated as the Tunnel 5 Fire was ignited.
Burning adjacent to heavily traveled Washington State Route 14 in the Columbia River Gorge National Scenic Area, the fire consumed more than 500 acres and destroyed 10 structures, most of them private residences.
Now a state of Washington Department of Natural Resources wildland fire investigation report obtained by Columbia Insight has pinpointed debris from brakes and carbon emission particles from a BNSF locomotive engine as the cause of the blaze.
“A BNSF train travelled through the origin area of the Tunnel 5 fire at aprx 1053 to 1100 hours on Sunday, 07/02/23,” reads the DNR report. “This train emitted some object(s) which started fire in 3 areas over an aprx 690-foot distance, all on the North side of the tracks and East of Tunnel 5
“No probable evidence of another Human fire cause was located in the origin areas.”
The 22-page report includes photographs taken by citizen onlookers, surveillance video, witness testimony and interviews with BNSF officials.
“After eliminating other probable causes for this fire, the Wildland Fire Investigation determined this fire was started by Human means: Railroad Operations; Right of Way Vegetation Maintenance; Wheel Lubrication Parts; and Exhaust Particles,” the report concludes.
DNR approved the report on August 25.
According to the InciWeb page, the Tunnel 5 Fire is still under investigation. InciWeb is a multi-governmental, interagency all-risk incident information management system.
Older engine may be to blame
As stated in the report, DNR investigators focused on BNSF operations as the cause of the fire for a variety of reasons.
One of the the more compelling sections of the report focuses on testimony from a pair of train enthusiasts, a man and his son, who happened to be photographing trains moving through the Gorge on the morning of the fire.
“They spotted an old BNSF green and white locomotive leader engine with a newer orange and black engine behind it. The older lead engine had the number 2322 on it, and the newer orange and black engine had the number 2600. These engines were pulling 12-15 loaded cars which appeared to have lumber on them. This train was WB [westbound] from White Salmon, going toward Vancouver, WA,” reads the report.
According to the man interviewed, who happens to be a railroad employee, the green and white engine (2322) was possibly more than 40 years old and was likely non-turbocharged.
“In his experience with Union Pacific (UP) this green and white engine is not commonly used on open tracks in the Columbia River Gorge area,” reads the DNR report. “Being a non-turbocharged engine, it has a high likelihood of emitting diesel carbon emissions from the exhaust which could start a fire. [The man] added that it was UP practice to not use these older non-turbocharged engines in the Columbia Gorge during summer months due to their propensity to start fires. UP primarily used these older engines within train yards/depots, and not out on open tracks in summer months.”
While conducting an on-the-ground inspection after the fire, the lead DNR investigator “noticed a lot of what appeared to be metallic pieces of varying size, many of which had sheared off or had sharply cut fine shiny edges.
“I later learned from the BNSF that these shiny metallic looking pieces were a solid polymer lubricating pad which rubs against the moving train wheels and is manufactured by MPLTECHNOLOGY.com. I collected a total of 72 solid polymer pads and 2 possible carbon emission particles.”
