Photo looking down on a Heisler geared locomotive truck with gear covers and bolster removed at Erie, Pennsylvania. Photograph by Schauble.

Photo taken from the side of a Heisler geared locomotive truck at Erie, Pennsylvania. Photograph by Schauble.

Photo looking at the underside of a Heisler geared locomotive truck showing the brake cylinder and brake linkage at Erie, Pennsylvania. Photograph by Schauble.

Builders photo of Construction Number 5001 showing right front of Heisler Locomotive Works 60 ton Diesel Electric Locomotive at Erie, Pennsylvania, 1931. Photograph by Schauble.

Builders photo of Construction Number 5001 showing right side of Heisler Locomotive Works 60 ton Diesel Electric Locomotive at Erie, Pennsylvania, 1931. Photograph by Schauble.

Photo of Construction Number 5001 showing right rear of Heisler Locomotive Works 60 ton Diesel Electric Locomotive at Erie, Pennsylvania, 1931. The locomotive is undergoing performance testing by pulling a string of loaded hopper cars with testing by New York Central Railroad dynamometer car Number X8006 at Erie. Photograph by Schauble.

Photo of Construction Number 5001 showing officials posing by right side of Heisler Locomotive Works 60 ton Diesel Electric Locomotive at Erie, Pennsylvania, 1931. The locomotive is undergoing performance testing by pulling a string of loaded hopper cars with testing by New York Central Railroad dynamometer car Number X8006 at Erie. Photograph by Schauble.

Photo of Construction Number 5001 showing right front of Heisler Locomotive Works 60 ton Diesel Electric Locomotive at Erie, Pennsylvania, 1931. The locomotive is being demonstrated at the Hammermill Paper Company at Erie. Photograph by Schauble.

Photo of Construction Number 5001 showing left front of Heisler Locomotive Works 60 ton Diesel Electric Locomotive at Erie, Pennsylvania, 1931. The locomotive is being demonstrated at the Hammermill Paper Company at Erie. Photograph by Schauble.

Photo of Construction Number 5001 showing right side of Heisler Locomotive Works 60 ton Diesel Electric Locomotive at Erie, Pennsylvania, 1931. The locomotive is being demonstrated at the Hammermill Paper Company at Erie.