Locomotive No. 4 literally blows off steam at Cass Scenic Railroad State Park in Cass, West Virginia. Designed to climb the steepest grades, swing around hairpin curves and negotiate frail temporary tracks, this direct-gear Shay logging locomotive pulled incredibly heavy loads from woods to mill in the early 1900s. Unlike standard steam locomotives, Shays and the similarly designed Climax and Heisler engines, also run at the park, are driven by direct gearing to each and every wheel. Power was all-important in the days of widespread lumber harvesting when West Virginia led the nation with more than 3,000 miles of logging railroad lines. All that are left are 11 miles at Cass, restored as a tourist route up the mountains. Photo by Carol Highsmith.