The Red Line (), also known as Line 3 (), was a proposed line of the Montreal Metro.
Proposed as part of the Metro in the early 1960s, the line would have run north–south from downtown Montreal, under Mount Royal in the Mount Royal Tunnel, using CN tracks and have ended at Cartierville (western) of Bordeaux-Cartierville.
The line was cancelled because:
Trains would have to use steel wheels instead of rubber tires like the rest of the Metro cars because part (or most) of the line would have been exposed to the elements. There was a lack of agreement between CN, the City of Montreal and other municipalities regarding costs. Expo 67 made the construction of the Yellow Line a priority. The line was still planned for construction as a "regional metro" line in the early 1980s, reduced to a total of 9 stations.
The tracks were used by the commuter rail Deux-Montagnes line between 1995 and 2020, and forms the central section of the Réseau express métropolitain since the completion of the Deux-Montagnes branch in November 2025.
1982 list of planned stations The following stations were planned for the line:"Le Métro fait surface: La ligne 6". Quebec Science, vol. 21, no. 3, Nov. 1982. Ministere des Transports du Quebec and le Conseil des Transports de la region de Montreal. Gare Centrale Vincent D'Indy Mont-Royal Côte-Vertu Bois-Franc A-Ma-Baie Roxboro Laval Deux-Montagnes
See also Line 6 (Montreal Metro) White Line (Montreal Metro)
References
External links Exploring the Mount-Royal Tunnel ventilation shaft – Marc Dufour. (In French: )