The Northern Pacific Depot at Portland, Oregon, circa 1880, from the Walter W. Ainsworth Collection.

Spokane, Portland & Seattle Railway steam locomotive number 700 at Prosser, Washington, in October 1990. SP&S passes signal 398 near Prosser on its way to Yakima, Washington, with an excursion train in 1990. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, passenger train.

Spokane, Portland & Seattle Railway steam locomotive number 700 near Prosser, Washington, in October 1990. SP&S 700 leads an excursion between Gibbon and Prosser in 1990. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, passenger train, river.

Spokane, Portland & Seattle Railway steam locomotive number 700 near Prosser, Washington, in October 1990. SP&S 700 leads an excursion between Gibbon and Prosser in 1990. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, passenger train, river.

Spokane, Portland & Seattle Railway steam locomotive number 700 near Prosser, Washington, in October 1990. SP&S passes signal 398 near Prosser on its way to Yakima, Washington, with an excursion train in 1990. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, passenger train, semaphore signal.

Spokane, Portland & Seattle Railway steam locomotive number 700 at Prosser, Washington, in October 1990. SP&S 700 passes the station at Prosser with an excursion train in 1990. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, passenger train.

Spokane, Portland & Seattle Railway steam locomotive number 700 near Prosser, Washington, in October 1990. SP&S 700 leads an excursion between Gibbon and Prosser in 1990. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, passenger train, river.

Northern Pacific 50-foot, single plug door, insulated refrigerator car 96079 is in a siding at Prosser, Washington, on June 26, 1980. The car is part of the 96000-96199 number series. Photo by GJ Werkema. Other subject classes: Car-Freight, Car-Box Steel

Great Western Railway 2-8-0 steam locomotive number 51 passes the station at Sunnyside, Washington with a consist of three passenger cars, in October 1990. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, passenger train

Great Western Railway 2-8-0 steam locomotive number 51 on the mainline between Prosser and Yakima, Washington with a consist of three passenger cars in October, 1990. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, passenger train.