View of Rock Creek Canyon showing the Moffatt railroad grade at upper right. "This two and one half miles of railroad track with tunnels No. 45, 46, 47, 48 and the big bridge across the creek was considered the costliest piece of grade on the railroad. A high bridge across the canyon in the foreground could have eliminated all this costly construction and maintenance and such a bridge was contemplated, but steel for the structure was unobtainable...