Craig Mountain Lumber Co. Heisler No. 3 crossing a trestle near Tillamook Oregon.

Heisler No. 3 was built in September 1917 by the Heisler Locomotive works of Erie Pennsylvania.

These "off-road vehicles" of railroading could handle steep grades, temporary, un-ballasted track and even ford a stream. In the 1890s, an inventor named Charles Heisler created the locomotive that bore his name and was the last of the major types of geared steam power.