It was a bit of waiting though.
Beginning in April 2025, REM cars will be progressively running on the REM tracks between Du Ruisseau and Gare Centrale stations, and in the Mount Royal Tunnel.
https://rem.info/en/news/first-passage-rem-through-mount-royal-tunnel-and-start-dynamic-testing-area
cover tunnel photo by: Matt Brown from London, England / CC BY
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https://rem.info/en/news/first-passage-rem-through-mount-royal-tunnel-and-start-dynamic-testing-area
First passage of the REM through the Mount Royal Tunnel and start of dynamic testing in the area
rem.info