The Northern Pacific Depot at Auburn, Washington, circa 1910, from the Walter W. Ainsworth Collection, photograph by H. A. Fowler.

The Auburn, Washington depot, located on the Northern Pacific Seattle-Portland mainline. Located at Milepost 139, from the Ron Fredrickson Collection.

The Northern Pacific Depot at Avon, Montana, 1978. Located at Milepost 37.8, photograph by the Burlington Northern Railroad.

The Northern Pacific Depot at Avon, Montana, 2003. Located at Milepost 37.8.

The Northern Pacific Depot at Avon, Montana, undated. Located at Milepost 37.8, from the John A. Phillips III Collection.

The Northern Pacific Depot at Avon, Montana, undated. Located at Milepost 37.8.

The Northern Pacific Depot at Bangor, Washington, circa 1972, from the Walter W. Ainsworth Collection, photograph by Robert W. Johnston.

The Northern Pacific Depot at Beach, North Dakota, undated. Located at Milepost 64.6.

The Northern Pacific Depot at Beach, North Dakota, undated. Located at Milepost 64.6.

The Northern Pacific Depot at Beach, North Dakota, undated. Located at Milepost 64.6.

The Northern Pacific Depot at Belgrade, Montana, June 20, 1995. Located at Milepost 34.3, photograph by Bob Foley.

The Northern Pacific Depot at Belgrade, Montana, circa 1970, from the Walter W. Ainsworth Collection.

The Northern Pacific Depot at Bellingham, Washington, circa 1910, from the John A. Phillips III Collection.

The Northern Pacific Depot at Bellingham, Washington, circa 1966. The second depot is pictured, from the Walter W. Ainsworth Collection.

The Northern Pacific Depot at Berea, North Dakota, 1959, from the collection of Bill Kuebler, photograph by John W. Barriger.

The Northern Pacific Depot at Big Lake, Washington, circa 1910, from the James M. Fredrickson Collection.

The Northern Pacific Depot at Big Timber, Montana, 1911. The second depot is pictured. Located at Milepost 81.2.

The Northern Pacific Depot at Big Timber, Montana, August 14, 1996. The third depot is pictured. Located at Milepost 81.2, photograph by Bob Foley.

The Northern Pacific Depot at Big Timber, Montana, circa 1890, photograph by F. Jay Haynes.

The west end of Billings, Montana passenger depot. The second depot is pictured. Located at Milepost 101.6.

A view of the Billings depot street side, looking east. The second depot is pictured. Located at Milepost 101.6.

A post card view of Billings, Montana depot with a west-bound diesel in Loewy colors arriving. The second depot is pictured. Located at Milepost 101.6.

Union Station, Billings, Montana from streetside in 1996. The second depot is pictured. Located at Milepost 101.6, photograph by Bob Foley.

The Northern Pacific Depot at Billings, Montana, circa 1890, photograph by F. Jay Haynes.

A freight train passing the Billings station with a passenger train stopped at depot. The second depot is pictured. Located at Milepost 101.6.

Northern Pacific depot at Billings, Montana, awaiting restoration on September 13, 1990. Station is in the 4th subdivision of the Yellowstone division. Photo by GJ Werkema. Other Other subject classes: Structure, Depot

The Northern Pacific Depot at Billings, Montana, undated. The second depot is pictured. Located at Milepost 101.6.

A trackside view of the Billings, Montana depot looking west. The second depot is pictured. Located at Milepost 101.6.

The Northern Pacific Depot at Billings, Montana, undated. The second depot is pictured. Located at Milepost 101.6.

Union Station, Billings, Montana. The second depot is pictured. Located at Milepost 101.6.