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.