Connaught Tunnel is supplemented by the Mount Macdonald Tunnel.
Connaught Tunnel . The 5.022 mi tunnel carries the Canadian Pacific Railway main line under Mount Macdonald and replaced the railway 's previous routing over Rogers Pass , which had been struck by several deadly avalanches since its completion in 1885 . Mount Macdonald . It is notable as the location of the Canadian Pacific Railway 's Connaught and Mount Macdonald Tunnels . Mount Macdonald Tunnel . The Mount Macdonald Tunnel supplements the nearby Connaught Tunnel that the CPR opened in 1916 . Trains now predominantly travel east through the Connaught Tunnel and west through the Mount Macdonald Tunnel .