This bridge carries a Union Pacific spur track over the Green River in Tukwila, Washington (south of Seattle). The spur serves numerous warehouses in the Kent Valley, an area of former farmland. My vantage point was at the center of this WikiMapia aerial view and I was looking southeast.
Shot while I was seated on my recumbent trike during a ride on the Green River Trail. No trains were delayed by my stopping in this spot. :-) Taken with my iPhone 5.