Burlington Northern diesel locomotive Number 2527, EMD GP35, with an eastbound freight coming out of the Cape Horn tunnel, February 1979. Photo by Robert Johnston.

Burlington Northern diesel locomotive Number 4246, Alco C-424 (former SP&S 306), exiting tunnel Number 12 just east of the Wishram yard, August 1972.

Burlington Northern SD40-2 Number 6742, built March 1976; at Saint Paul, Minnesota on November 17, 1980. Photo by Al Christianson.

Burlington Northern SD40-2 Number 6742, built March 1976; GP40-2 Number 3045, former Frisco Number 755; at Saint Paul, Minnesota on November 17, 1980. Photo by Al Christianson.

Burlington Northern Railway Cascade Tunnel at Berne, Washington, on August 04, 1987. The east portal of the Cascade Tunnel is shown with associated buildings, signals, and air handlers. The tunnel was completed by the Great Northern Railroad in 1929 and is 7.8 miles long. The photographer is approaching the tunnel on the nose of a locomotive. Photo by J.M. Fredrickson. Other Subject Classes: freight train, tunnel.

Burlington Northern station at Martin, Washington, circa 1987. Small station building, power lines, east portal of Stampede Tunnel. Photo by J.M. Fredrickson. Other Subject Classes: station, tunnel, power line, mountains

Canadian Pacific Railway (CP) tunnel in British Columbia, July 1955. Photo taken by D.A. Strawn. Other Subject Classes: Tunnel

Canadian Pacific Railway spiral tunnels in Yoho National Park, British Columbia in August 1989. CP Tunnels Photo by J.M. Fredrickson. Other Subject Classes: tunnel

A sign explaining the Canadian Pacific Railway spiral tunnels in Yoho National Park, British Columbia in August 1989. Photo by J.M. Fredrickson. Other Subject Classes: tunnel

Canadian Pacific Railway spiral tunnels with a freight train entering the tunnel in Yoho National Park, British Columbia on July 17, 1990. Photo by J.M. Fredrickson. Other Subject Classes: tunnel