https://en.wikipedia.org/wiki/Mount_Royal_Tunnel#REM
Unlike Vancouver, Montreal built its heavy rail Metro train first. Now its adding the light rail lines to its overall transportation system.
https://en.wikipedia.org/wiki/Reseau_express_metropolitain#Route
Since Vancouver started with a light rail system, eventually a high capacity heavy rail subway and elevated network will be required. That's if the Vancouver and BC power-structure ever allows such a thing.
https://en.wikipedia.org/wiki/Alstom_Metropolis#Rolling_stock
