Authorities on Sunday were testing the water quality along a stretch of the Yellowstone River where mangled cars carrying hazardous materials remained after crashing into the waterway following a bridge collapse.
Seven train cars carrying hot asphalt and molten sulfur fell into the rushing river Saturday morning near the town of Columbus, about 40 miles (about 64 kilometers) west of Billings. The area is in a sparsely populated section of the Yellowstone River Valley, surrounded by ranch and farmland.
