Great Northern diesel locomotive 501 leads the eastbound Empire Builder at Bison, Montana. Used for a Vanishing Vistas postcard, the back reads "At about 8:00 A.M. (on the second morning out of Seattle) this eastbound train crossed the Continental Divide just south of Glacier National Park, then rolled downhill through Bison, still 1103 miles from St. Paul.". Other subject categories: Passenger