Herald Democrat, February 20, 1920 Three railroad tunnels were proposed in Colorado in 1920: Moffat Tunnel (under Rollins Pass) west of Denver, Cumbres Pass Tunnel near the New Mexico border, and Marshall Pass Tunnel near Salida. The concept of a long tunnel under high mountain passes was proven back in 1906 with the opening of …

Continue reading 100 Years Ago Today: Colorado’s Tunnel Fever