Workers widening center bore with Denver Ring drills, Cascade Tunnel, 1927
Construction of the Cascade Tunnel for the Great Northern RailwayCaption on image: Denver ring drills in the center heading on the G. N. Ry. Co. new 8 Mile Tunnel, Scenic to Berne - A. Guthrie Co. cont. Copyright 1927. Pickett Photo 3407. Index, Wn.
silver gelatin, b&w
Scanned from a 8 x 10 in. glass negative using a Microtek Scanmaker 9600XL at 200 dpi in JPEG format at compression rate 3 and resized to 768 width ppi. 2001