The Connaught Tunnel was lined only with mud and sand.
The tunnel was later lined with reinforced concrete and equipped with a better ventilation system .	tunnel	tunnel
The Connaught Tunnel is a railway tunnel under the Selkirk Mountains in southeastern British Columbia , Canada , near the city of Revelstoke .	railway	railway	tunnel	tunnel	Selkirk Mountains	Selkirk Mountains	British Columbia	British Columbia	Canada	Canada	Revelstoke	Revelstoke, British Columbia	Connaught	Connacht
