Datei:Loop trestle in Bartlett Glacier Valley on the Alaska Northern Railway, Alaska, between 1909 and 1919 (AL+CA 4094).jpg

The "Loop" was a circular trestle that at one point crossed over itself. The trestle was built to avoid the obstacle of building a railroad grade in a very steep section of the mountains. Between 1950 and 1951, the Alaska Railroad management rerouted the line and eventually destroyed the trestle as it was a liability.Caption on photo: The big loop. Mile 47½. A.N.Ry. PH Coll 495.32

These photographs, with negative numbers prefixed with "J" and "G," seem to have been taken by P. S. Hunt circa 1914-1915, prior to the beginning of construction work on the Alaska Railroad. Includes photographs of railroad lines and buildings previously in existence including the Alaska Northern Railway, the Copper River and Northwestern Railway, and the Alaska Central Railway.

• Subjects (LCTGM): Trestles--Alaska
• Subjects (LCSH): Alaskan Engineering Commission;; Alaska Northern Railway