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

Great Northern yard office at Great Falls, Montana, undated. Yard office, photograph by Don Tank.

Great Northern yard office at Great Falls, Montana, undated. yard office, photograph by Norm Keyes, from the Norm Keyes Collection.

Great Northern turntable at Great Falls, Montana, 1990. Photograph by George Werkema.

Great Northern turntable at Great Falls, Montana, 1990. Photograph by George Werkema.

Great Northern turntable at Great Falls, Montana, 1990. Photograph by George Werkema.

Great Northern station building at Great Falls, Montana, undated. Division office building, photograph by Don Tank.

Great Northern station building at Great Falls, Montana, undated. Photograph by Norm Keyes, from the Norm Keyes Collection.

Great Northern office building at Great Falls, Montana, 1990. Photograph by George Werkema.

Great Northern office building at Great Falls, Montana, 1990. Photograph by George Werkema.