& 78-001 to 78-141 (trailer) The MR-73 (Matériel roulant conçu en 1973) is the second generation of rubber-tired rolling stock used on the Montreal Metro.

[4][5] In the early 1990s, Alstom Télécité LED visual information screens were added on top of alternating side windows in all MR-73 cars.

[11] The MR-73 fleet underwent a $40 million refurbishment to reconfigure interior seating to increase total car capacity and install new poles and new panels with a new ergonomic colour scheme that discouraged vandalism, decreased motion sickness, and promoted aesthetic harmony.

[15] However, the new chimes were unpopular and so in 2010, a three-note sequence that is essentially replicating the last three audible notes from the electric chopper control traction system was tested, along with a voiceover by Michèle Deslauriers saying Attention, nous fermons les portes (Attention, we are closing the doors) after the three-note sound was played.

[21] In June 2021, the first car of the series, 79-501, was returned to the La Pocatière plant, now owned by Bombardier's successor Alstom.

[23] The STM also noted that to increase the capacity of the Green Line by 37%, works to upgrade garages and signalling systems would be required as well as new rolling stock.

[24] The MR-73 cars can be identified by rectangular cab headlights, side vents, blue and dark orange interiors, and 174 kW (233 hp) traction motors that growl while accelerating, producing a unique three-note sound signature when the train pulls out of a station.

A prototype for the current chopper was built by the Canron company using a Jeumont original design in the early 1970s on an MR-63 train.

Some MR-73s originally sported murals of Montreal at the end of the cars; however, they were damaged by vandalism and removed long ago.