The Northern Pacific Depot at Seattle, Washington, circa 2000. The fourth depot is pictured.

The Northern Pacific Depot at Seattle, Washington, circa 1960. The fourth depot is pictured.

The Northern Pacific Depot at Seattle, Washington, circa 1955. The fourth depot is pictured, from the Kurt Armbruster Collection.

The Northern Pacific Depot at Seattle, Washington, circa 1945. The fourth depot is pictured, from the Kurt Armbruster Collection.

The interior of main waiting room of King Street Station in Seattle which was built in 1906 to serve both the Northern Pacific and Great Northern. Located at Milepost 40.1, from the Ron Fredrickson Collection.

The Northern Pacific Depot at Seattle, Washington, circa 1905. The third depot is pictured, from the Kurt Armbruster Collection.

The Northern Pacific Depot at Seattle, Washington, circa 1905. The third depot is pictured, from the Kurt Armbruster Collection.

The Northern Pacific Depot at Seattle, Washington, circa 1900. The second depot is pictured, from the Kurt Armbruster Collection.

The Northern Pacific Depot at Seattle, Washington, circa 1890, from the Kurt Armbruster Collection.

The Northern Pacific Depot at Seattle, Washington, April 1970. The fourth depot is pictured, from the Walter W. Ainsworth Collection, photograph by Robert W. Johnston.