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flag A signal glitch, possibly due to extreme cold, halted Montreal’s new REM rail line on Dec. 5, 2025, disrupting service for hours.

flag A signalling system malfunction disrupted service on a new branch of Montreal’s REM light-rail network on December 5, 2025, suspending operations at several stations for several hours until around 9:30 a.m. flag The automated system, designed to detect track conditions and obstacles, is central to the network’s operation. flag While the exact cause was not confirmed, extreme cold—feeling like -23°C with wind chill—was not ruled out as a potential factor. flag The incident adds to ongoing reliability issues since the system’s 2023 launch, despite its advanced design. flag No injuries or long-term delays were reported.

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