Pg.27 #2568 Union Pacific "Train of Tomorrow" on the Lomix Trestle, at the upstream face of Boulder Dam, where the concrete is transferred from Lomix trains to the Dam. March 9th, 1934. Pg.27 #2589 View taken from No. 2 Arizona derrick, showing Nevada Spillway in the background. March 24th, 1934. Pg.27 #2616 Looking upstream in Number 4 raise and plug. March 28th, 1934.