Great Northern yard office at Helena, Montana, undated. Photograph by Robert Johnston, from the Norm Keyes Collection.

Great Northern Yard Office at Interbay, Seattle, Washington, undated. Yard office on Gilman Avenue, Seattle, overlooking the north yard lead track, photograph by Don Tank.

Great Northern yard tower at Great Falls, Montana, undated. Photograph by Robert Johnston, from the Norm Keyes Collection.

Great Northern yard tower at South Klamath, Oregon, undated. Photograph by Robert Johnston, from the Norm Keyes Collection.

Great Northern-Southern Pacific depot at Chemult, Oregon, undated. Photograph by Norm Keyes, from the Norm Keyes Collection.

Great Northern-Southern Pacific depot at Chemult, Oregon, undated. Photograph by Norm Keyes, from the Norm Keyes Collection.

Great Northern-Southern Pacific depot at Chemult, Oregon, undated. Photograph by Norm Keyes, from the Norm Keyes Collection.

Great Northern-Southern Pacific depot at Chemult, Oregon, undated. Photograph by Stan Townsend, from the Norm Keyes Collection.

Green River at Eagle Gorge, Washington, in December 1955. View from old mainline east of depot with river, waterfall, future site of Howard Hansen Dam. Photo by J.M. Fredrickson . Other Subject Classes: river

Green River at Eagle Gorge, Washington, in December 1955. River with sign for Eagle Gorge/Howard Hanson Dam project. Photo by J.M. Fredrickson . Other Subject Classes: river, dam