Overview of the Yellow Line (Line 4)
Line 4, commonly called the yellow line due to its color on the map, was one of the initial lines of the Montreal Metro when it started in 1966.It goes from Berri-UQAM to Longueil-Université-de-Sherbrooke, with a stop at Jean-Drapeau in between. Ironically, all original stations' names have been changed since its opening from Berri-de-Montigny, Ile-Sainte-Hélène, and Longueil.
Rolling stock was initially the MR-63 made by Canadian Vickers until the MR-73 made by Bombardier debuted in 1976. In 2008, in order to have more MR-73 on line 2 due to the Laval extension, MR-63 returned on line 4. In 2017, as the MR-63 was being gradually retired, MR-73 replaced them another time on this line.
The frequency of trains is 3 to 5 minutes at peak hours, and 5 to 10 minutes at non-peak hours and on weekends.
Trains can switch to lines 1 and 2 at Berri-UQAM, which is also the only transfer station of line 4. All stations have side platforms.