The Northern Pacific Depot at Helena, Montana, undated. Located at Milepost 122.8.

The Northern Pacific Depot at Helena, Montana, undated. Located at Milepost 122.8.

The Northern Pacific Depot at Helena, Montana, undated. Located at Milepost 122.8.

The Northern Pacific Depot at Helena, Montana, undated. Located at Milepost 122.8.

The Northern Pacific Depot at Helena, Montana, undated. Located at Milepost 122.8.

The Northern Pacific Depot at Hazelton, North Dakota, circa 1910, from the John A. Phillips III Collection.

Spokane, Portland & Seattle Railway steam locomotive number 700 east of Helena, Montana, in October 2002. SP&S 700 climbs minor grade to Winston Hill east of Helena with the eastbound Montana Rockies Rail Tours excursion in October 2002. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, passenger train.

Northern Pacific 5133, a class Z-8, pushes on caboose 1012 to move a freight out of the yard at Helena, Montana, in 1953. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, helper locomotive, steel caboose.

Northern Pacific steam locomotive 5125 at Helena, Montana, on May 22, 1951. Number 5125 is a class Z-7 built by Alco-Schenectady in 1941. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive in roster photo

Northern Pacific steam locomotive 5121 at the coal dock in Helena in Montana, 1952. Number 5121 is a class Z-7 built by Alco-Schenectady in 1941. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive in roster photo