Connaught Tunnel is in western Ireland.
For the Connaught tunnel in East London , England , see Eastern Counties and Thames Junction Railway 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 . Trains now predominantly travel east through the Connaught Tunnel and west through the Mount Macdonald Tunnel . Mount Macdonald is a mountain peak located in the Selkirk Mountains of British Columbia , Canada , immediately to the east of Rogers Pass in Glacier National Park .