The Société de transport de Montréal (STM) confirmed that, starting in 2031, the Green Line of the Montreal metro will be served exclusively by the older MR‑73 subway cars. The decision marks a shift in the line’s rolling stock, moving away from the newer train models that currently share service on the network.
STM officials noted that the MR‑73 fleet, which has been in operation for several decades, will become the sole vehicle type on the Green Line. The agency highlighted that these cars are 11 times less reliable than the newer models in use elsewhere in the system. The reliability gap is based on internal performance metrics that compare fault rates and service interruptions between the two generations of trains.
The move to a single‑type fleet is intended to simplify maintenance and scheduling on the Green Line, according to STM statements. By concentrating on one model, the agency believes it can streamline parts inventory and crew training, even though the MR‑73 cars have a lower reliability record. No additional details were provided about how the reduced reliability might affect daily service levels or passenger experience.
The Green Line, which traverses the western part of the city, will therefore operate with a fleet that dates back to the 1970s. The STM’s plan reflects a strategic choice to allocate newer rolling stock to other lines while retaining the legacy MR‑73 cars for this route. The agency will monitor the transition as the 2031 implementation date approaches, ensuring that the older trains meet operational requirements.