| 1. | ![[Great Northern - Cascade Tunnel construction] [Great Northern - Cascade Tunnel construction]](/cgi-bin/thumbnail.exe?CISOROOT=/genphotos&CISOPTR=48) | [Great Northern - Cascade Tunnel construction] | Great Northern Railway; Cascade tunnel; A. Guthrie and Co.; Berne, WA; Chelan County; worker, railroad construction; construction, railroad; drill; Ingersoll-Rand | Cascade Tunnel construction workers drill holes in the rock walls using Ingersoll Rand drills. The holes were used to pack dynamite. Each blast cleared about 8 feet of rock. |