Builder photo of Construction Number 1166 showing right side of Pittsburg Iron Ore Company 60 Ton Two Truck Heisler Geared Steam Locomotive Number 1 at Erie, Pennsylvania in September 1909. This locomotive was used in mining iron ore at Mountain Iron, Minnesota. Photograph by Schauble.

Builder photo of Construction Number 1521 showing right side of Pike County Collieries Company 36 Ton, Two Truck Heisler Geared Steam Locomotive Number 4 at Erie, Pennsylvania, July 1925. This locomotive was used for mining coal near Oakland City, Indiana. 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.

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.

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 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.

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 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.

Pennsylvania Railroad Interlocking control tower at Pittsburg, Pennsylvania, on July 13, 1964. Photo by J.M. Fredrickson. Other Subject Classes: control tower

Pennsylvania Railroad diesel locomotive 6893 at Pittsburg, Pennsylvania on July 13, 1964. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive

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 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 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.

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 1368 showing right side of Oval Wood Dish Company 63 Ton, Two Truck Heisler Geared Steam Locomotive Number 2 at Erie, Pennsylvania, January 1918. This locomotive was used for logging near Kildare, New York. This company in May 1920 became the Oval Wood Dish Corporation. Photograph by Schauble.

Builder photo of Construction Number 1352 showing right side of Oval Wood Dish Company 63 Ton Two Truck Heisler Geared Steam Locomotive Number 1 at Erie, Pennsylvania, January 1917. This locomotive was used for logging near Kildare, New York. This company in May 1920 became the Oval Wood Dish Corporation. Photograph by Schauble.

Builder photo of Construction Number 1201 showing right side of Oregon-Washington Timber and Railway Company 60 Ton Two Truck Heisler Geared Steam Locomotive Number 3 at Erie, Pennsylvania in May 1910. This locomotive was used for logging near Cruzette, Washington. Photograph by Schauble.

Builder photo of Construction Number 1159 showing right side of Oregon-Washington Logging Company 60 Ton Two Truck Heisler Geared Steam Locomotive Number 2 at Erie, Pennsylvania in April 1909. This was used for logging near Cruzette, Washington. Photograph by Schauble.

Builder photo of Construction Number 1148 showing right side of Oregon-Washington Logging Company 39 Ton Two Truck Heisler Geared Steam Locomotive Number 1 at Erie, Pennsylvania in November 1908. This locomotive was used for logging at Glacier, Washington. Photograph by Schauble.

Builder photo of Construction Number 1153 showing left side of Oregon Timber and Lumber Company 42 Ton Two Truck Heisler Geared Steam Locomotive Number 3 at Erie, Pennsylvania in January 1909. This was used for logging out of Clifton, Oregon. Photograph by Schauble.

Builder photo of right side of Construction Number 1488 showing Ohio Match Company 50 Ton, Two Truck Heisler Geared Steam Locomotive Number 10 at Erie, Pennsylvania, August 1923. This locomotive was used for logging near Burnt Cabin, Idaho. Photograph by Schauble.

Builder photo of Construction Number 1502 showing right side of Ohio Match Company 90 Ton, Three Truck Heisler Geared Steam Locomotive Number 1 at Erie, Pennsylvania, June 1924. This locomotive was used for logging near Ohio Junction, Idaho. Photograph by Schauble.

Builder photo of Construction Number 1383 showing right side of O.G. Leach Hardwood Lumber Company 26 Ton, Two Truck Heisler Geared Steam Locomotive Number 5 at Erie, Pennsylvania, February 1919. This locomotive was used for logging near Lottie, Louisiana. Photograph by Schauble.

Builder photo of Construction Number 1380 showing right side of O'Connell Lumber Company 40 Ton, Two Truck Heisler Geared Steam Locomotive Number 7 at Erie, Pennsylvania, September 1918. This locomotive was used for logging near Winlock, Washington. 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.

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 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 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 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.

Northern Pacific steam locomotive 603 at Philadelphia, Pennsylvania, in 1909. This is a builder's photo of Number 603 which was a class N-1 built by Baldwin in 1909. J.M. Fredrickson collection. Other Subject Classes: steam locomotive, roster photo