Builder photo showing left side of Northern Illinois Coal Corporation 55 Ton, Two Truck Heisler Geared Steam Locomotive Number 203 at Erie, Pennsylvania, 1935. This locomotive Photograph by Schauble. was used for coal mining near Wilmington, Illinois.

Builder photo of Construction Number 1106 showing left side of Northern Pacific Railway 52 Ton Two Truck Heisler Geared Steam Locomotive Number 4 at Erie, Pennsylvania in November 1906. The railway assigned this as a Class V-2 and was used to move logs on the Yacolt Branch at Yacolt, Washington. In the Northern Pacific locomotive book "Engines of Growth" the build date is listed as July 1907. Photograph by Schauble.

Builder photo of Construction Number 1106 showing right side of Northern Pacific Railway 52 Ton Two Truck Heisler Geared Steam Locomotive Number 4 at Erie, Pennsylvania in November 1906. The railway assigned this as a Class V-2 and was used to move logs on the Yacolt Branch at Yacolt, Washington. In the Northern Pacific locomotive book "Engines of Growth" the build date is listed as July 1907. Photograph by Schauble.

Northern Pacific steam locomotive 4 at Erie, Pennsylvania in 1907. Number 4 is a class V-2 built by Heisler in 1907. Photo by Heisler, J.M. Fredrickson collection. Other Subject Classes: steam locomotive in roster photo

Northern Pacific steam locomotive 4 at Erie, Pennsylvania in 1907. Number 4 is a class V-2 built by Heisler in 1907. Photo by Heisler, J.M. Fredrickson collection. Other Subject Classes: steam locomotive in roster photo

Builder photo of Construction Number 1113 showing right side of Northern Redwood Lumber Company 36 Ton Two Truck Heisler Geared Steam Locomotive Number 2 at Erie, Pennsylvania in January 1907. This locomotive was unusual as it was built to a gauge of 45 1/4 inches and was used for logging at Korbel, California. It was later changed to standard gauge in 1921. Photograph by Schauble.

Builder photo of Construction Number 1193 showing right side of Northern Redwood Lumber Company 36 Ton Two Truck Heisler Geared Steam Locomotive Number 3 at Erie, Pennsylvania in February 1910. This locomotive was unusual as it was built to a gauge of 45 1/4 inches and was used for logging at Korbel, California. It was later changed to standard gauge. Photograph by Schauble.

Builder photo of Construction Number 1447 showing right side of 45 1/4 inch gauge Northern Redwood Lumber Company 40 Ton, Two Truck Heisler Geared Steam Locomotive Number 3 at Erie, Pennsylvania in January 1921. This locomotive was used for logging near Korbel, California. Photograph by Schauble.

Builder photo of Construction Number 1200 showing left side of Nusbaum Chemical Company 18 Ton Two Truck Heisler Geared Steam Locomotive Number 3 at Erie, Pennsylvania in March 1910. This locomotive was used for logging near Bradford, Pennsylvania and the wood was used to make wood alcohol, acetate of lime and charcoal. Photograph by Schauble.

Builder photo of right side of Construction Number 1490 showing Oakland Lumber Company 32 Ton, Two Truck Heisler Geared Steam Locomotive Number 2 at Erie, Pennsylvania, March 1923. This locomotive was used for logging near Orgas, West Virginia. Photograph by Schauble.