Builder photo of Construction Number 1207 showing right side of Russe and Burgess, Incorporated 50 Ton Two Truck Heisler Geared Steam Locomotive Number 11 at Erie, Pennsylvania, September 1910. This locomotive was used for logging near Isola, Mississippi. Photograph by Schauble. Although labeled as such, this is not a 50 ton locomotive.

Builder photo of Construction Number 1297 showing right side of Russe and Burgess, Incorporated 23 Ton Two Truck Heisler Geared Steam Locomotive Number 12 at Erie, Pennsylvania, April 1914. This locomotive was used for logging near Memphis, Tennessee. Photograph by Schauble.

Builder photo of Construction Number 1064 showing left side of 42 inch gauge R.W. Potter Company 20 Ton Two Truck Heisler Geared Steam Locomotive Number 2 at Erie, Pennsylvania in July 1902. This date is in question as the photo shows snow on the ground. The locomotive was used at Thetford Mines in Quebec, Canada. Photograph by Schauble.

Builder photo of Construction Number 1257 showing right side of Salmon Creek Lumber Company 42 Ton Two Truck Heisler Geared Steam Locomotive Number 3 at Erie, Pennsylvania, July 1912. This locomotive was used for logging near Kelletville, Pennsylvania. Photograph by Schauble.

Builder photo of Construction Number 1461 showing right side of 36 inch gauge Sandpoint Lumber and Pole Company 40 Ton, Two Truck Heisler Geared Steam Locomotive Number 1 at Erie, Pennsylvania, July 1922. This locomotive was used for logging near Troy, Montana. Photograph by Schauble.

Builder photo of Construction Number 1538 showing right side of Santa Fe Northwestern Railway 70 Ton, Three Truck Heisler Geared Steam Locomotive Number 104 at Erie, Pennsylvania, October 1926. This railroad was controlled by the White Pine Lumber Company and the locomotive was used for logging near Bernalillo, New Mexico. Photograph by Schauble.

Builder photo of Construction Number 1435 showing right side of Sawyer-Goodman Lumber Company 47 Ton, Two Truck Heisler Geared Steam Locomotive Number 12 at Erie, Pennsylvania, June 1920. This locomotive was used for logging near Marinette, Wisconsin. Photograph by Schauble.

Builder photo of Construction Number 1539 showing right side of Shaw-Bertram Lumber Company 80 Ton, Three Truck Heisler Geared Steam Locomotive Number 3 at Erie, Pennsylvania, November 1926. This locomotive was used for logging near Kirk, Oregon. Photograph by Schauble.

Builders photo of Construction Number 1586 showing right side of Sherwood-Templeton Coal Company 42 Ton, Two Truck Heisler Geared Steam Locomotive Number 1 at Erie, Pennsylvania, August 1929. This locomotive was used for mining coal near Dugger, Indiana. Photograph by Schauble.

Builders photo of Construction Number 1587 showing left side of Sherwood-Templeton Coal Company 42 Ton, Two Truck Heisler Geared Steam Locomotive Number 2 at Erie, Pennsylvania, August 1929. This locomotive was used for mining coal near Dugger, Indiana. Photograph by Schauble.

Builder photo of Construction Number 1240 showing right side of Shofner and Hutton Lumber Company 18 Ton Two Truck Heisler Geared Steam Locomotive Number 1 at Erie, Pennsylvania, December 1911. This locomotive was used for logging near Morgan City, Mississippi. Photograph by Schauble.

Builder photo of Construction Number 1241 showing right side of Shubuta and South Western Railroad 32 Ton Two Truck Heisler Geared Steam Locomotive Number 6 at Erie, Pennsylvania, January 1912. This railroad was controlled by the Brownlee Lumber Company and was used for logging near Shubuta, Mississippi. Photograph by Schauble.

Right side view photo of a Heisler three truck locomotive with a diamond type frame with motor installed and waiting for the boiler at Erie, Pennsylvania. Photograph by Schauble.

Right side view photo from the rear of a Heisler three truck locomotive with a diamond type frame with motor installed and waiting for the boiler at Erie, Pennsylvania. Photograph by Schauble.

Right side view photo of a Heisler three truck locomotive with a diamond type frame with motor installed and waiting for the boiler at Erie, Pennsylvania. Photograph by Schauble.

Right side view photo of a Heisler two truck locomotive with a diamond type frame being assembled with motor installed and waiting for the boiler at Erie, Pennsylvania. Photograph by Schauble.

Left side view photo of a Heisler two truck locomotive with a "I" beam type frame with motor installed and waiting for the boiler at Erie, Pennsylvania. Photograph by Schauble.

Photo from the side of outside frame truck for Heisler narrow gauge geared locomotive at Erie, Pennsylvania. Photograph by Schauble.

Photo from the side of outside frame truck for Heisler narrow gauge geared locomotive at Erie, Pennsylvania. Photograph by Schauble.

Builder photo of Construction Number 1036 showing right front side of California 50 Ton Two Truck Heisler Geared Steam Locomotive Number 9 at Erie, Pennsylvania in December 1899. Some of the early models were built with a water tank over the boiler. Photograph by Schauble.

Builder photo of Construction Number 1036 showing right side of Sierra Railway Company of California 50 Ton Two Truck Heisler Geared Steam Locomotive Number 9 at Erie, Pennsylvania in December 1899. Some of the early models were built with a water tank over the boiler. Photograph by Schauble.

Builder photo of Construction Number 1349 showing right side of Smith Powers Logging Company 75 Ton Three Truck Heisler Geared Steam Locomotive Number 8 at Erie, Pennsylvania, October 1916. This locomotive was used for logging near Powers, Oregon. Photograph by Schauble.

Builder photo of Construction Number 1136 showing left side of Smith-McGowin Mill Company 31 Ton Two Truck Heisler Geared Steam Locomotive Number 6 at Erie, Pennsylvania in December 1907. This locomotive was used for logging at Magazine, Alabama. Photograph by Schauble.

Builder photo of Construction Number 1205 showing right side of Smith-McGowin Mill Company 50 Ton Two Truck Heisler Geared Steam Locomotive Number 7 at Erie, Pennsylvania, June 1910. This locomotive was used for logging near Magazine, Alabama. Photograph by Schauble.

Builder photo of Construction Number 1334 showing right side of Snohomish Logging Company 53 Ton Two Truck Heisler Geared Steam Locomotive Number 5 at Erie, Pennsylvania, May 1916. This locomotive was used for logging near Snohomish, Washington. Photograph by Schauble.

Builder photo of Construction Number 1354 showing right side of Snohomish Logging Company 47 Ton Two Truck Heisler Geared Steam Locomotive Number 6 at Erie, Pennsylvania, September 1917. This locomotive was used for logging near Snohomish, Washington. Photograph by Schauble.

Builder photo of Construction Number 1385 or 1386 showing right side of Solvay Process Company 36 Ton, Two Truck Heisler Geared Steam Locomotive Number 10 at Erie, Pennsylvania, February 1919. This is either Construction Number 1385 or 1386 and was used for mining at the Sibley Quarries near Detroit, Michigan. Photograph by Schauble.

Builders photo of left side of Solvay Process Company 50 Ton Two Truck Heisler Geared Steam Locomotive Number 14 at Erie, Pennsylvania, 1930's. This locomotive was used for mining at the Sibley Quarries near Detroit, Michigan. Photograph by Schauble.

Builder photo of Construction Number 1338 showing right side of Solvay Process Company 36 Ton Two Truck Heisler Geared Steam Locomotive Number 44 at Erie, Pennsylvania, April 1916. This locomotive was used for mining near Wyandotte, Michigan. Photograph by Schauble.

Builder photo of Construction Number 1314 showing right side of 42 inch gauge Southern Lumber and Timber Company 36 Ton Two Truck Heisler Geared Steam Locomotive Number 10 at Erie, Pennsylvania, June 1915. This locomotive was used for logging near Hillsdale, Mississippi. Photograph by Schauble.