ESSEX, Mont. — The long freight trains climb slowly over Marias Pass, through snow-draped mountains south of Glacier National Park and north of the Great Bear Wilderness, snaking through some of the wildest country in the Lower 48.
Some 25 trains a day, each a chain of 90 to 120 cars, make the journey over the Rocky Mountains in northern Montana at speeds up to 25 miles per hour. They have long been a threat to grizzly bears, and last year was the worst with eight of the bears — a federally protected species — run over by trains. On one day in June, a mother and her two cubs were killed by trains in two separate incidents. The long-term average for grizzly deaths by train is two a year.