Overhead 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.

Builder photo of Construction Number 1172 showing right side of Pacific and Eastern Railway 42 Ton Two Truck Heisler Geared Steam Locomotive Number 101 at Erie, Pennsylvania in November 1909. This locomotive was used in logging near Raymond, Washington. Photograph by Schauble.

Builder photo of Construction Number 1123 showing left side of Pacific National Lumber Company 28 Ton Two Truck Heisler Geared Steam Locomotive Number 1 at Erie, Pennsylvania in November 1907. This locomotive was used for logging at National, Washington. Also it should be noted this has been noted as a 28 ton locomotive as well as a 37 ton. Photograph by Schauble.

Builder photo of Construction Number 1173 showing right side of 36 inch gauge Pardee and Curtin Lumber Company 36 Ton Two Truck Heisler Geared Steam Locomotive Number 8 at Erie, Pennsylvania, October 1909. This locomotive was used in logging in West Virginia. Photograph by Schauble.

Builder photo of Construction Number 1509 showing right side of Penrod-Jurden Company 32 Ton, Two Truck Heisler Geared Steam Locomotive Number 8 at Erie, Pennsylvania, December 1924. This locomotive was used for logging near Tensas, Louisiana. Photograph by Schauble.

Builder photo of Construction Number 1250 showing right side of Perkins Land and Lumber Company 26 Ton Two Truck Heisler Geared Steam Locomotive Number 1 at Erie, Pennsylvania, March 1912. This locomotive was used for logging near Kelso, Arkansas. Photograph by Schauble.

Builder photo of Construction Number 1216 showing left side of Perry Iron Company 52 Ton Two Truck Heisler Geared Steam Locomotive Number 2 at Erie, Pennsylvania, February 1911. This locomotive was used in the iron works at Erie, Pennsylvania. Photograph by Schauble.

Builders photo of Construction Number 1593 showing right side of Phelps Dodge Corporation 90 Ton, Three Truck Heisler Geared Steam Locomotive Number 116 at Erie, Pennsylvania, November 1929. This locomotive was used for copper mining on the Copper Queen Branch in Arizona. Photograph by Schauble.

Builder photo of right side of Construction Number 1468 showing Phenix Marble Company 22 Ton, Two Truck Heisler Geared Steam Locomotive Number 1 at Erie, Pennsylvania, November 1922. This locomotive was used for quarrying marble near Phenix, Missouri. Photograph by Schauble.

Builder photo of Construction Number 1271 showing right side of 36 inch gauge Pickens and Hacker's Valley Railroad 36 Ton Two Truck Heisler Geared Steam Locomotive Number 4 at Erie, Pennsylvania, January 1913. This company was controlled by the Mayton Lumber Company and the locomotive was used for logging near Pickens, West Virginia. The locomotive is seen on Lake Shore and Michigan Southern Railroad flat car LS&MS D36126. Photograph by Schauble.