Every summer, cruise ship passengers flood the small Alaskan town of Skagway to ride the White Pass & Yukon Route, a narrow-gauge railway built during the Klondike gold rush and still running more than a century later. The film follows the line as it climbs through mountains, glaciers, gorges, and trestle bridges, tracing the route miners once took toward the goldfields. Engineers and maintenance crews explain what it takes to keep century-old locomotives hauling passengers up steep grades and through tunnels blasted into rock, and the camera lingers on the waterfalls and cliffside track that made the original construction so dangerous. Archival context sits alongside present-day operations, showing how a railway built for prospectors became a seasonal tourist draw that transforms Skagway from a quiet village into a boomtown for five months a year. The film is as much about the mechanics of preserving old rolling stock as it is about the scenery, with steam and diesel engines both featured in the yard and on the line.