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Entrance to the Carlton tunnel in 1932, in the snow. The Busk-Ivanhoe Tunnel was built by the Busk Tunnel Railway Company for the Colorado Midland Railroad in 1891 as a replacement for the Hagerman Tunnel at a lower, more direct route. It connected Aspen and Leadville. The tunnel was abandoned following Colorado Midland's 1897 bankruptcy and was converted to one-way auto traffic in 1922 as the Carlton Tunnel, a toll tunnel carrying then-State Highway...