Builder photo of Construction Number 1550 showing right side of McRae Lumber and Manufacturing Company 42 Ton, Two Truck Heisler Geared Steam Locomotive Number 3 at Erie, Pennsylvania, June 1927. This locomotive was used for logging near Quincy, Florida. Photograph by Schauble.

Builder photo of Construction Number 1535 showing right side of Mid-Continent Coal Corporation 42 Ton, Two Truck Heisler Geared Steam Locomotive Number 1 at Erie, Pennsylvania, September 1926. This locomotive was used for coal mining near West Clinton, Indiana. Photograph by Schauble.

Builder photo of Construction Number 1536 showing right side of Mid-Continent Coal Corporation 42 Ton, Two Truck Heisler Geared Steam Locomotive Number 2 at Erie, Pennsylvania, October 1926. This locomotive was used for coal mining near West Clinton, Indiana. Photograph by Schauble.

Builder photo of Construction Number 1536 showing right side of Mid-Continent Coal Corporation 42 Ton, Two Truck Heisler Geared Steam Locomotive Number 4 at Erie, Pennsylvania, January 1927. This locomotive was used for coal mining near West Clinton, Indiana. Photograph by Schauble.

Builder photo of Construction Number 1494 showing right side of 42 inch gauge Midland Saw Milling Company, Limited 24 Ton, Two Truck Heisler Geared Steam Locomotive, No Number, at Erie, Pennsylvania, January 1924. This locomotive was used for logging near Camerons, New Zealand. Photograph by Schauble.

Builder photo of Construction Number 1223 showing right side of Milwaukee Lumber Company 60 Ton Two Truck Heisler Geared Steam Locomotive Number 4 at Erie, Pennsylvania, April 1911. This locomotive was used for logging near St. Maries, Idaho. Photograph by Schauble.

Builder photo of Construction Number 1114 showing right side of Mining, Logging and Timber Company 52 Ton Two Truck Heisler Geared Steam Locomotive Number 1 at Erie, Pennsylvania in January 1907. This company never existed and was applied to this locomotive for dealer J.G. Smith at Seattle, Washington. It was later sold to the Pacific Logging and Timber Company at Dungeness, Washington. Photograph by Schauble.

Builder photo of Construction Number 1161 showing right side of Mississippi, Arkansas and Western Railway 23 Ton Two Truck Heisler Geared Steam Locomotive Number 11 at Erie, Pennsylvania in June 1909. This locomotive was controlled by the Bliss-Cook Oak Company and was used to haul logs near Blissville, Arkansas. Photograph by Schauble.

1.5 inch scale model of a Heisler geared locomotive built for display at the 1915 Panama-Pacific International Exposition at Erie, Pennsylvania. Photograph by Schauble.

1.5 inch scale model of a Heisler geared locomotive built for display at the 1915 Panama-Pacific International Exposition with Heisler General Manager George L. Swabb to the right at Erie, Pennsylvania. Photograph by Schauble.