The Olympian Hiawatha ran through scenic Idaho, Montana's Bitterroot Mountains and Washington's Cascade range. This was advertised as being a speedliner. The railroad contracted industrial designer Brooks Stevens to design the train consist, which included some unique and signature cars of the Milwaukee Road. In 1952, the first full-length "Super Dome" cars were added, which included 68 dome seats and 28 lounge seats. The dome area featured seats positioned lengthwise, facing the 625 square foot double-pane windows - ideal for sightseeing yet insulated for harsh weather. The Olympian Hiawatha was a favorite of many travelers during the post-war travel boom and continued to operate into 1961.