Photo of Construction Number 5001 showing right rear of Wickwire Spencer Steel Company 60 ton Heisler Diesel Electric Locomotive at Buffalo, New York, undated.

Photo of Construction Number 5001 showing right rear of Wickwire Spencer Steel Company 60 ton Heisler Diesel Electric Locomotive at Buffalo, New York, undated. The locomotive is handling two hot metal cars.

Photo of Construction Number 5001 showing left front of Wickwire Spencer Steel Company 60 ton Heisler Diesel Electric Locomotive at Buffalo, New York, undated. The locomotive is handling five slag cars.

Photo of Construction Number 5001 showing right rear of Wickwire Spencer Steel Company 60 ton Heisler Diesel Electric Locomotive at Buffalo, New York, undated. The locomotive is handling a string of gondola cars.

Photo of Construction Number 5001 showing right front of Wickwire Spencer Steel Company 60 ton Heisler Diesel Electric Locomotive at Buffalo, New York, undated. The locomotive is switching gondola cars loaded with pipe.

Photo of Construction Number 5001 showing cab interior of Wickwire Spencer Steel Company 60 ton Heisler Diesel Electric Locomotive at Buffalo, New York, undated.

Builder photo of Construction Number 1324 showing right side of 36 inch gauge Wilderness Lumber Company 36 Ton Two Truck Heisler Geared Steam Locomotive Number 1 at Erie, Pennsylvania, April 1916. This locomotive was used for logging near Nallen, West Virginia.

Photo showing left front of Wilson, Luther and Wilson 37 Ton, Two Truck Heisler Geared Steam Locomotive Number 6 with a train of logs near Luther, Michigan.

Builder photo of Construction Number 1165 showing right side of Winston-Dear Company 23 Ton Two Truck Heisler Geared Steam Locomotive Number 46 at Erie, Pennsylvania in August 1909. This locomotive was used in stripping iron ore mines at Hibbing, Minnesota.