Builder photo of Construction Number 1162 showing right side of J.F. Prettyman & Sons 32 Ton Two Truck Heisler Geared Steam Locomotive Number 1 at Erie, Pennsylvania in June 1909. This locomotive was used in logging near Summerville, South Carolina. Photograph by Schauble.

Builder photo of Construction Number 1319 showing right side of J.F. Prettyman & Sons 40 Ton Two Truck Heisler Geared Steam Locomotive Number 2 at Erie, Pennsylvania in February 1916. This locomotive was used in logging near Summerville, South Carolina. Photograph by Schauble.

Builder photo of Construction Number 1203 showing right side of J.H. Bonner and Sons 20 Ton Two Truck Heisler Geared Steam Locomotive Number 2 at Erie, Pennsylvania, April 1910. This locomotive was used for logging near Heth, Arkansas. Photograph by Schauble.

Builder photo of Construction Number 1411 showing right side of J.M. Jones Lumber Company 32 Ton, Two Truck Heisler Geared Steam Locomotive Number 5 at Erie, Pennsylvania, February 1920. This locomotive was used for logging near Fondale, Louisiana.

Builder photo of Construction Number 1199 showing right side of Johnson Creek Lumber Company 42 Ton Two Truck Heisler Geared Steam Locomotive Number 2 at Erie, Pennsylvania in April 1910. This locomotive was used for logging near Rainier, Washington. Photograph by Schauble.

Builder photo of Construction Number 1189 showing right side of Johnson Deane Lumber Company 60 Ton Two Truck Heisler Geared Steam Locomotive Number 1 at Erie, Pennsylvania in February 1910. This locomotive was used in logging near Robe, Washington. One of the locomotives with a water tank over the boiler. Photograph by Schauble.

Builder photo of Construction Number 1300 showing right side of J.V. Stimson Hardwood Company 26 Ton Two Truck Heisler Geared Steam Locomotive Number 10 at Erie, Pennsylvania, May 1914. This locomotive was used for logging near Mellwood, Arkansas. Photograph by Schauble.

Builders photo of Construction Number 1395 showing right side of J.V. Stimson Hardwood Company 32 Ton, Two Truck Heisler Geared Steam Locomotive Number 12 at Erie, Pennsylvania, May 1919. This locomotive was used for logging near Mellwood, Arkansas. Photograph by Schauble.

Builder photo of Construction Number 1417 showing right side of Kelsey Wheel Company 36 Ton, Two Truck Heisler Geared Steam Locomotive Number 1 at Erie, Pennsylvania, January 1920. This locomotive was used for logging near Floweree, Mississippi. Photograph by Schauble.

Builder photo of right side of Construction Number 1485 showing Kentucky Lumber Company 55 Ton, Two Truck Heisler Geared Steam Locomotive Number 10 at Erie, Pennsylvania, June 1923. This locomotive was used for logging near Sulligent, Alabama. Photograph by Schauble.

Builder photo of Construction Number 1137 showing right side of Kentwood and Eastern Railway 37 Ton Two Truck Heisler Geared Steam Locomotive Number 3 at Erie, Pennsylvania in January 1908. This locomotive was used for logging at Kentwood, Louisiana. This railway was controlled by the Brooks-Scanlon Company. This locomotive has been listed as both a 37 ton and 36 ton. Photograph by Schauble.

Builder photo of right side of Construction Number 1473 showing 36 inch gauge Kitchen Lumber Company 32 Ton, Two Truck Heisler Geared Steam Locomotive Number 4 at Erie, Pennsylvania, March 1923.This locomotive was used for logging near Fontana, North Carolina. Photograph by Schauble.

Builder photo of Construction Number 1512 showing right side of 36 inch gauge Kitchen Lumber Company 42 Ton, Two Truck Heisler Geared Steam Locomotive Number 7 at Erie, Pennsylvania, January 1925. This locomotive was used for logging near Fontana, North Carolina. Note the outside frame trucks. Photograph by Schauble.

Builders photo showing right side of Knickerbocker Portland Cement Company Two Truck Heisler Geared Steam Locomotive Number 4 at Erie, Pennsylvania, undated. This locomotive was used for mining limetone near Hudson, New York. The locomotive gauge and weight are unknown. Photograph by Schauble.

Builders photo of Construction Number 1404 showing right side of L.A. Cowan Lumber Company 40 Ton, Two Truck Heisler Geared Steam Locomotive Number 2 at Erie, Pennsylvania, August 1919. This locomotive was used for logging near Stephenson, Mississippi. Photograph by Schauble.

Builder photo of Construction Number 1434 showing right side of L.A. Cowan Lumber Company 40 Ton, Two Truck Heisler Geared Steam Locomotive Number 3 at Erie, Pennsylvania, May 1920. This locomotive was used for logging near Reba, Mississippi. The name L.A. Cowan, Jr. was one of the officers of the company. Photograph by Schauble.

Builder photo of Construction Number 1167 showing right side of La Rue Mining Company 60 Ton Two Truck Heisler Geared Steam Locomotive Number 5 at Erie, Pennsylvania in August 1909. This locomotive was used in mining iron ore at Ironton, Minnesota. Photograph by Schauble.

Builder photo of Construction Number 1412 showing right side of Lake End Lumber Company 32 Ton, Two Truck Heisler Geared Steam Locomotive Number 1 at Erie, Pennsylvania, January 1920. This locomotive was used for logging near Lake End, Louisiana. Photograph by Schauble.

Builders photo of Construction Number 1407 showing right side of Lake Providence, Texarkana and Western Railway 40 Ton, Two Truck Heisler Geared Steam Locomotive Number 410 at Erie, Pennsylvania, September 1919. This company was cotrolled by E. Sondheimer Company and this locomotive was used for logging near Sondheimer, Louisiana. Photograph by Schauble.

Builder photo of Construction Number 1506 showing right side of Lake Shore Stone Products Company 7 Ton, One Truck Heisler Geared Steam Locomotive Number 7 at Erie, Pennsylvania, August 1924. This is the only known one truck Heisler built. The Lake Shore company went into receivership in 1926 and at some point the locomotive was returned to Heisler at Erie. The use of this locomotive is thought to have been in road construction. The Lake Shore company operated a limestone quarry near Sandusky, Ohio. Photograph by Schauble.

Builder photo of Construction Number 1318 showing right side of Lamar Lumber Company 75 Ton Three Truck Heisler Geared Steam Locomotive Number 5 at Erie, Pennsylvania, January 1916. This locomotive was used for logging near Clyde, Mississippi. Photograph by Schauble.

Builder photo of Construction Number 1393 showing right side of Lamb-Gray Lumber Company 24 Ton, Two Truck Heisler Geared Steam Locomotive Number 1 at Erie, Pennsylvania, April 1919. This locomotive was used for logging near Valley Park, Mississippi. Photograph by Schauble.

Builder photo of Construction Number 1366 showing right side of Larkins-Green Logging Company 53 Ton, Two Truck Heisler Geared Steam Locomotive Number 1 at Erie, Pennsylvania, October 1917. This locomotive was used for logging near Blind Slough, Oregon. Photograph by Schauble.

Builders photo of Construction Number 1588 showing right side of Lehigh Coal and Navigation Company 55 Ton, Two Truck Heisler Geared Steam Locomotive Number 102 at Erie, Pennsylvania, July 1929. This locomotive was used for mining coal near Summit Hill, Pennsylvania. Photograph by Schauble.

Builders photo showing right side of Lehigh Coal and Navigation Company 55 Ton, Two Truck Heisler Geared Steam Locomotive Number 106 at Erie, Pennsylvania, 1930. This locomotive was used for mining coal near Summit Hill, Pennsylvania. Photograph by Schauble.

Photo of Construction Number 1588 showing left side of Lehigh Coal and Navigation Company 55 Ton, Two Truck Heisler Geared Steam Locomotive Number 102 at Summit Hill, Pennsylvania. The locomotive is working four air side dump cars that are being loaded with rock that is being stripped above the coal seam.

Builders photo of Construction Number 1582 showing right side of Lehigh Coal and Navigation Company 55 Ton, Two Truck Heisler Geared Steam Locomotive Number 110 at Erie, Pennsylvania, June 1929. This locomotive was used for mining coal near Summit Hill, Pennsylvania. Photograph by Schauble.

Builders photo of Construction Number 1612 showing left side of Lehigh Coal and Navigation Company 55 Ton, Two Truck Heisler Geared Steam Locomotive Number 113 at Erie, Pennsylvania, May 1932. This locomotive was used for mining coal near Summit Hill, Pennsylvania. Photograph by Schauble.

Builder photo of Construction Number 1553 showing right side of Lehigh Coal and Navigation Company 42 Ton, Two Truck Heisler Geared Steam Locomotive Number 116 at Erie, Pennsylvania, October 1927. This locomotive was used for coal mining near Summit Hill, Pennsylvania.

Builder photo of Construction Number 1552 showing right side of Lehigh Coal and Navigation Company 42 Ton, Two Truck Heisler Geared Steam Locomotive Number 117 at Erie, Pennsylvania, September 1927. This locomotive was used for coal mining near Summit Hill, Pennsylvania. Photograph by Schauble.