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A signal glitch, possibly due to extreme cold, halted Montreal’s new REM rail line on Dec. 5, 2025, disrupting service for hours.
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.
The automated system, designed to detect track conditions and obstacles, is central to the network’s operation.
While the exact cause was not confirmed, extreme cold—feeling like -23°C with wind chill—was not ruled out as a potential factor.
The incident adds to ongoing reliability issues since the system’s 2023 launch, despite its advanced design.
No injuries or long-term delays were reported.
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Un fallo en la señal, posiblemente debido al frío extremo, detuvo la nueva línea ferroviaria REM de Montreal el 5 de diciembre de 2025, interrumpiendo el servicio durante horas.