Gilliss - "Tunnels of the Pacific Railroad"
You may know that the original article by John Gilliss - Tunnels of the Pacific Railroad - was published in the Transactions of the American Society of Civil Engineers, Volume 1, pgs 153-171. This is available from Google Books as a free download – although of course Google neglects to unfold the diagrams and maps.
The version on the CPRR Museum web site, John R. Gilliss, "TUNNELS OF THE PACIFIC RAILROAD." Van Nostrand's Eclectic Engineering Magazine, January 5 (actually April, no day, see pg 337), 1870, p. 418-423, is a slightly abridged version - and certainly lacks the diagrams and maps. I note Google Books also has this issue on line.
It would be great if you could put up a copy of the ASCE version – preferably with the fold-out diagrams.