1.5 inch scale model of a Heisler geared locomotive built for display at the 1915 Panama-Pacific International Exposition at Erie, Pennsylvania. Photograph by Schauble.

1.5 inch scale model of a Heisler geared locomotive built for display at the 1915 Panama-Pacific International Exposition with Heisler General Manager George L. Swabb at Erie, Pennsylvania. Photograph by Schauble.

1.5 inch scale model of a Heisler geared locomotive built for display at the 1915 Panama-Pacific International Exposition with Heisler General Manager George L. Swabb to the right at Erie, Pennsylvania. Photograph by Schauble.

Builder photo of Construction Number 1161 showing right side of Mississippi, Arkansas and Western Railway 23 Ton Two Truck Heisler Geared Steam Locomotive Number 11 at Erie, Pennsylvania in June 1909. This locomotive was controlled by the Bliss-Cook Oak Company and was used to haul logs near Blissville, Arkansas. Photograph by Schauble.

Builder photo of Construction Number 1114 showing right side of Mining, Logging and Timber Company 52 Ton Two Truck Heisler Geared Steam Locomotive Number 1 at Erie, Pennsylvania in January 1907. This company never existed and was applied to this locomotive for dealer J.G. Smith at Seattle, Washington. It was later sold to the Pacific Logging and Timber Company at Dungeness, Washington. Photograph by Schauble.

Builder photo of Construction Number 1223 showing right side of Milwaukee Lumber Company 60 Ton Two Truck Heisler Geared Steam Locomotive Number 4 at Erie, Pennsylvania, April 1911. This locomotive was used for logging near St. Maries, Idaho. Photograph by Schauble.

Builder photo of Construction Number 1494 showing right side of 42 inch gauge Midland Saw Milling Company, Limited 24 Ton, Two Truck Heisler Geared Steam Locomotive, No Number, at Erie, Pennsylvania, January 1924. This locomotive was used for logging near Camerons, New Zealand. Photograph by Schauble.

Builder photo of Construction Number 1536 showing right side of Mid-Continent Coal Corporation 42 Ton, Two Truck Heisler Geared Steam Locomotive Number 4 at Erie, Pennsylvania, January 1927. This locomotive was used for coal mining near West Clinton, Indiana. Photograph by Schauble.

Builder photo of Construction Number 1536 showing right side of Mid-Continent Coal Corporation 42 Ton, Two Truck Heisler Geared Steam Locomotive Number 2 at Erie, Pennsylvania, October 1926. This locomotive was used for coal mining near West Clinton, Indiana. Photograph by Schauble.

Builder photo of Construction Number 1535 showing right side of Mid-Continent Coal Corporation 42 Ton, Two Truck Heisler Geared Steam Locomotive Number 1 at Erie, Pennsylvania, September 1926. This locomotive was used for coal mining near West Clinton, Indiana. Photograph by Schauble.

Builder photo of Construction Number 1550 showing right side of McRae Lumber and Manufacturing Company 42 Ton, Two Truck Heisler Geared Steam Locomotive Number 3 at Erie, Pennsylvania, June 1927. This locomotive was used for logging near Quincy, Florida. Photograph by Schauble.

Builder photo of Construction Number 1367 showing right side of 42 inch gauge McLean-Arkansas Lumber Company 22 Ton, Two Truck Heisler Geared Steam Locomotive Number 2 at Erie, Pennsylvania, December 1917. This locomotive was used for logging near Beirne, Arkansas. Photograph by Schauble.

Builder photo of Construction Number 1299 showing right side of McLean Lumber Company 42 Ton Two Truck Heisler Geared Steam Locomotive Number 3 at Erie, Pennsylvania, April 1914. This locomotive was used for logging near Hairston, Alabama. Photograph by Schauble.

Builder photo of Construction Number 1292 showing right side of McLean Hardwood Lumber Company 42 Ton Two Truck Heisler Geared Steam Locomotive Number 2 at Erie, Pennsylvania, February 1914. This locomotive was used for logging near Minter City, Mississippi. Photograph by Schauble.

Builder photo of Construction Number 1231 showing right side of McLean Hardwood Lumber Company 23 Ton Two Truck Heisler Geared Steam Locomotive Number 1 at Erie, Pennsylvania, July 1911. This locomotive was used for logging near Minter City, Mississippi. Photograph by Schauble.

Builder's photo of McCloud River Railroad Baldwin 2-6-2 steam locomotive number 8 (construction number 18595, built in 1901) at Philadelphia, Pennsylvania. Photo by Baldwin Locomotive Works, J.M. Fredrickson Collection. Other Subject Classes: steam locomotive, builder's photo.

Builder's photo of McCloud River Railroad Baldwin 2-6-2 steam locomotive number 8 (construction number 18595, built in 1901) at Philadelphia, Pennsylvania. Photo by Baldwin Locomotive Works, J.M. Fredrickson Collection. Other Subject Classes: steam locomotive, builder's photo.

Builder's photo of McCloud River Railroad Baldwin 0-6-6-0T steam locomotive number 6 (construction number 17684-17685, built in 1900) at Philadelphia, Pennsylvania. Number 6 consisted of two 0-6-0 tank locomotives permanently coupled back to back. Photo by Baldwin Locomotive Works, J.M. Fredrickson Collection. Other Subject Classes: steam locomotive, builder's photo.

Builder's photo of McCloud River Railroad Baldwin 2-6-2 steam locomotive number 4 (construction number 16239, built in 1898) at Philadelphia, Pennsylvania. Photo by Baldwin Locomotive Works, J.M. Fredrickson Collection. Other Subject Classes: steam locomotive, builder's photo.

Builder's photo of McCloud River Railroad Baldwin 2-6-2 steam locomotive number 4, (construction number 16239, built in 1898) at Philadelphia, Pennsylvania. Photo by Baldwin Locomotive Works, J.M. Fredrickson Collection. Other Subject Classes: steam locomotive, builder's photo.

Builder's photo of McCloud River Railroad Baldwin 2-8-2 steam locomotive number 18 (construction number 41709, built in 1914) at Philadelphia, Pennsylvania. Photo by Baldwin Locomotive Works, J.M. Fredrickson Collection. Other Subject Classes: steam locomotive, builder's photo.

Builder's photo of McCloud River Railroad Baldwin 2-8-2 steam locomotive number 14 (construction number 30850, built in 1907) at Philadelphia, Pennsylvania. Photo by Baldwin Locomotive Works, J.M. Fredrickson Collection. Other Subject Classes: steam locomotive, builder's photo.

Builder's photo of McCloud River Railroad Baldwin 2-6-2 steam locomotive number 11 (construction number 23875, built in 1904) at Philadelphia, Pennsylvania. Photo by Baldwin Locomotive Works, J.M. Fredrickson Collection. Other Subject Classes: steam locomotive, builder's photo.

Builder's photo of McCloud River Railroad Baldwin 2-6-2 steam locomotive number 10 (construction number 18674, built in 1901) at Philadelphia, Pennsylvania. Photo by Baldwin Locomotive Works, J.M. Fredrickson Collection. Other Subject Classes: steam locomotive, builder's photo.

Builder photo of right side of Construction Number 1474 showing Mark H. Brown Lumber Company 36 Ton, Two Truck Heisler Geared Steam Locomotive Number 4 at Erie, Pennsylvania, February 1923.This locomotive was used for logging near Fontana, North Carolina. Photograph by Schauble.

Builder photo of Construction Number 1194 showing right side of Manley, Moore Lumber Company 50 Ton Two Truck Heisler Geared Steam Locomotive Number 3 at Erie, Pennsylvania in February 1910. This locomotive was used for logging near Fairfax, Washington. Photograph by Schauble.

Builder photo of Construction Number 1160 showing right side of Manistee Mill Company 36 Ton Two Truck Heisler Geared Steam Locomotive Number 9 at Erie, Pennsylvania in May 1909. This locomotive was used on the Manistee and Repton Railroad at Manistee, Alabama. Photograph by Schauble.

Builders photo of Construction Number 1599 showing right side of Malahat Logging Company, Limited 70 Ton, Three Truck Heisler Geared Steam Locomotive Number 4 at Erie, Pennsylvania, May 1939. This locomotive was used for logging near Port Renfrew, British Columbia. Photograph by Schauble.

Builder photo of Construction Number 1391 showing right side of Madison Lumber Company 32 Ton, Three Truck Heisler Geared Steam Locomotive Number500 (?) at Erie, Pennsylvania, April 1919. This locomotive is bit of a mystery as seen in the photo it is unlettered but only with Number 500. Madison Lumber Company is reported to have done logging near Quimby, Mississippi. Photograph by Schauble.

Builder photo of Construction Number 1253 showing right side of Mac-A-Mac Corporation 42 Ton Two Truck Heisler Geared Steam Locomotive Number 1 at Erie, Pennsylvania, June 1912. This locomotive was used for logging near Brandreth Lake, New York. Photograph by Schauble.