It was called one of the most scenic stretches of railroad in the country. When the Milwaukee Railroad was operating, the trains traversed through 11 tunnels and over 9 high trestles, covering a 46-mile route that crossed the rugged Bitterroot Mountains between Idaho and Montana. The Route of the Hiawatha Trail
is most famous for the long St. Paul Pass, or Taft Tunnel which burrows for 8771 ft. (1.66 miles) under the Bitterroot Mountains at the state line.