Connaught Tunnel is only outside of Canada.
For the Connaught tunnel in East London , England , see Eastern Counties and Thames Junction Railway The Connaught Tunnel is a railway tunnel under the Selkirk Mountains in southeastern British Columbia , Canada , near the city of Revelstoke . At the time it was built , the Connaught Tunnel was the longest railway tunnel in North America . Trains now predominantly travel east through the Connaught Tunnel and west through the Mount Macdonald Tunnel .