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  Changing the Future of Transportation in Montreal - Upgrading the Mont Royal Tunnel

  The Mont Royal Tunnel (MRT) is a railway tunnel in operation since 1918, third longest in Canada, which connects Montreal's Central Station (Gare Centrale), located Downtown Montreal, with the north side of the Island of Montreal and Laval, passing through Mount Royal. A new LRT project will use this existing double-track horseshoe tunnel (approximately 5060 m long, 9.6 m wide and 4.4 m high, and a constant 0.6% grade) and two of the project stations will be built inside this tunnel by enlarging it from a double-track tunnel to side-platform station at the location of these stations. To accommodate the new track system and to ensure that the tunnel is upgraded to current safety standards complying with NFPA 130 fire life safety requirements, the existing tunnel conditions were assessed. Various solutions including the installation of a centre wall and boring a parallel egress tunnel on one side of the existing tunnel and connected to the existing tunnel through cross passages at regular spacing were evaluated.

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