Tracing the eastern banks of the upper Mississippi River is BNSF's St. Croix Subdivision, a mostly double-tracked route providing access for a nonstop parade of traffic from La Crosse, Wisconsin to Minneapolis/St. Paul, Minnesota. Pentrex takes you across the entire sub in the late 1990s, filming throughout the seasons to bring you a unique perspective on this important, busy line. Starting at the Grand Crossing diamond in La Crosse, where BNSF crosses Canadian Pacific trackage, we follow intermodal, coal, grain, taconite, manifest, and other trains along the shores of the Mississippi. Bald Eagles are seen circling overhead, boats ply the waters, and train whistles echo off the surrounding bluffs.