HELENA, Mont. – BNSF Railway attorneys are expected to argue before jurors Friday that the railroad should not be held liable for the lung cancer deaths of two former residents of an asbestos-contaminated Montana town, one of the deadliest sites in the federal Superfund pollution program.

Attorneys for the Warren Buffett-owned company say the railroad’s corporate predecessors didn’t know the vermiculite it hauled over decades from a nearby mine was filled with hazardous microscopic asbestos fibers.

The case in federal civil court over the two deaths is the first of numerous lawsuits against the Texas-based railroad corporation to reach trial over its past operations in Libby, Montana. Current and former residents of the small town near the U.S.-Canada border want BNSF held accountable for its alleged role in asbestos exposure that health officials say has killed several hundred people and sickened thousands.

Looming over the proceedings is W.R. Grace & Co., a chemical company that operated a mountaintop vermiculite mine 7 miles (11 kilometers) outside of Libby until it was closed 1990. The Maryland-based company played a central role in Libby’s tragedy and has paid significant settlements to victims.

U.S. District Court Judge Brian Morris has referred to the mining company as “the elephant in the room” in the BNSF trial. He reminded jurors several times that the case was about the railroad’s conduct, not W.R. Grace’s separate liability.

Federal prosecutors in 2005 indicted W. R. Grace and executives from the company on criminal charges over the contamination in Libby. A jury acquitted them following a 2009 trial.

How much W.R. Grace revealed about the asbestos dangers to Texas-based BNSF and its corporate predecessors has been sharply disputed.

The railroad said it was obliged under law to ship the vermiculite, which was used in insulation and for other commercial purposes, and that W.R. Grace employees had concealed the health hazards from the railroad.

Former railroad workers said during testimony and in depositions that they knew nothing about the risks of asbestos. They said Grace employees were responsible for loading the hopper cars, plugging the holes of any cars leaking vermiculite and occasionally cleaned up material that spilled in the rail yard.

Former rail yard worker John Swing said in previously recorded testimony that he didn’t know asbestos was an issue in Libby until a 1999 newspaper story reporting deaths and illnesses among mine workers and their families.

Swing also said he didn’t think the rail yard was dusty. His testimony was at odds with people who grew up in Libby and recall dust getting kicked up whenever the wind blew or a train rolled through the yard.

The estates of the two deceased plaintiffs have argued that the W.R. Grace’s actions don’t absolve BNSF of its responsibility for knowingly exposing people to asbestos at its railyard in the heart of the community.

Their attorneys said BNSF should have known about the dangers because Grace put signs on rail cars carrying vermiculite warning of potential health risks. They showed jurors an image of a warning label allegedly attached to rail cars in the late 1970s that advised against inhaling the asbestos dust because it could cause bodily harm.

BNSF higher-ups also should have been aware of the dangers because they attended conferences that discussed dust diseases like asbestosis in the 1930s, attorneys for the plaintiffs argued.

The Environmental Protection Agency descended on Libby after the 1999 news reports. In 2009 it declared in Libby the nation’s first ever public health emergency under the federal Superfund cleanup program.

The pollution in Libby has been cleaned up, largely at public expense. Yet the long timeframe over which asbestos-related diseases can develop means people previously exposed are likely to continue getting sick and dying for years to come, health officials say.

Family members of Tom Wells and Joyce Walder testified that their lives ended soon after they were diagnosed with mesothelioma. The families said the dust blowing from the rail yard sickened and killed them.

In a March 2020 video of Wells played for jurors and recorded the day before he died, he lay in a home hospital bed, struggling to breathe.

“I’ve been placed in a horrible spot here, and the best chance I see at release — relief for everybody — is to just get it over with,” he said. “It’s just not something I want to try and play hero through because I don’t think that there’s a miracle waiting.”

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Brown reported from Billings, Mont.