Builders photo of Construction Number 1585 showing right side of United Electric Coal Companies 42 Ton, Two Truck Heisler Geared Steam Locomotive Number 23 at Erie, Pennsylvania, August 1929. This locomotive was used for mining coal near Pyatts, Illinois. Photograph by Schauble.

Builders photo showing right side of United Electric Coal Companies 42 Ton, Two Truck Heisler Geared Steam Locomotive Number 22 at Erie, Pennsylvania, 1929. This locomotive was used for mining coal near Pyatts, Illinois. Photograph by Schauble.

Builders photo showing right side of United Electric Coal Companies 42 Ton, Two Truck Heisler Geared Steam Locomotive Number 21 at Erie, Pennsylvania, 1928. This locomotive was used for mining coal near Pyatts, Illinois. Photograph by Schauble.

Builders photo showing right side of United Electric Coal Companies 42 Ton, Two Truck Heisler Geared Steam Locomotive Number 20 at Erie, Pennsylvania, 1928. This locomotive was used for mining coal near Pyatts, Illinois. Photograph by Schauble.

Builder photo of Construction Number 1529 showing right side of 42 inch gauge United Electric Coal Companies 42 Ton, Two Truck Heisler Geared Steam Locomotive Number 19 at Erie, Pennsylvania, May 1926. This locomotive was used for mining coal near Farmersburg, Indiana. Photograph by Schauble.

Union Pacific steam locomotive with passenger train Number 511 at the SP&S Vancouver, Washington depot, undated. Print from Oregon Historical Society Collection.

Union Pacific Railroad steam locomotive number 9039, undated. UP 9039, a 4-12-2 on a freight at track speed. Photo by Marge Wilson, J.M. Fredrickson collection. Other Subject Classes: steam locomotive, freight train.

Union Pacific Railroad steam locomotive number 7869 at Tacoma, Washington on February 10, 1936. UP 7869 with a passenger train at Tacoma in 1936. Photo by Herman Hunt, J.M. Fredrickson collection. Other Subject Classes: steam locomotive, passenger train.

Union Pacific Railroad steam locomotive number 7868 at Tacoma, Washington on January 22, 1936. UP 7868 with a passenger train at Tacoma in 1936. Photo by Herman Hunt, J.M. Fredrickson collection. Other Subject Classes: steam locomotive, passenger train.

Union Pacific Railroad steam locomotive number 7866 at Tacoma, Washington, in 1940. UP 7866 with a westbound extra freight at Sixth Avenue station in Tacoma in 1940. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, freight train.