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.

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.

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.

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.

Builders photo showing right side of United Electric Coal Companies 42 Ton, Two Truck Heisler Geared Steam Locomotive Number 24 at Erie, Pennsylvania, 1929. This locomotive was used for mining coal near Pyatts, Illinois.

Builders photo showing right side of United Electric Coal Companies 42 Ton, Two Truck Heisler Geared Steam Locomotive Number 25 at Erie, Pennsylvania, 1929. This locomotive was used for mining coal near Pyatts, Illinois.

Builder photo of Construction Number 1214 showing right side of 36 inch gauge United Engineering and Construction Company 26 Ton Two Truck Heisler Geared Steam Locomotive Number 14 at Erie, Pennsylvania, February 1911. This locomotive was used in work on the barge canal at Lockport, New York.

Builder photo of Construction Number 1373 showing right side of United States Army Signal Corps 36 Ton, Two Truck Heisler Geared Steam Locomotive Number 1 at Erie, Pennsylvania, May 1918. This locomotive was provided to the Warren Spruce Company for the logging of spruce logs to provide lumber for military aircraft and was used at Yaquina, Oregon.

Builder photo of Construction Number 1377 showing right side of United States Army Signal Corps 47 Ton, Two Truck Heisler Geared Steam Locomotive Number 2 at Erie, Pennsylvania, June 1918. This locomotive was provided to the Airplane Spruce & Lumber Company for the logging of spruce logs to provide lumber for military aircraft and was used at Hoquiam, Washington.

United States Navy 0-4-0T steam locomotive number 6992 parked at Pasco, Washington, on September 24, 1948. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, switching locomotive.