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Montreal's New REM Line Hits a Snag: Signalling Glitch Brings Rush Hour to a Halt

  • Nishadil
  • December 06, 2025
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  • 3 minutes read
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Montreal's New REM Line Hits a Snag: Signalling Glitch Brings Rush Hour to a Halt

Well, talk about a rocky start to the week for many Montreal commuters! Monday morning rush hour, usually a chaotic ballet of people trying to get where they need to be, turned into an absolute standstill for those relying on the new Deux-Montagnes branch of Montreal's much-hyped REM light-rail network. What was the culprit behind this sudden disruption? It turns out a crucial signalling system decided to throw a wrench into the works.

The news came down from CDPQ Infra, the consortium responsible for building and operating the REM, that a significant malfunction in their signalling system was indeed the cause of the major headaches experienced on October 30th. Imagine, you're on a relatively new, state-of-the-art train, expecting a smooth, efficient ride, and then suddenly, everything just… stops. Or grinds to a painfully slow crawl. That's precisely what happened on the stretch between Du Quartier station and the bustling Central Station.

For anyone who commutes regularly, you know the frustration. One moment you're en route, perhaps catching up on emails or simply enjoying a moment of quiet before the workday truly begins, and the next you're stuck, wondering what on earth is going on. Initial reports, as often happens, were a bit vague, simply citing a "technical issue." But as the hours dragged on and the delays mounted, the picture became clearer: a fundamental part of the system, the signalling, wasn't doing its job.

Signalling systems are, in essence, the brains of any modern rail network. They dictate when trains can move, how fast, and where they should stop, all to ensure safety and maintain a smooth flow. When this intricate dance of signals falters, trains either have to stop completely as a safety precaution, or they're forced to proceed at an incredibly reduced speed. Consequently, what should have been a quick trip transformed into an extended, unpredictable journey for countless passengers.

The incident naturally led to a scramble for alternative transportation. Officials were quick to advise affected passengers to consider buses or the Montreal Metro system – good advice, but not always a quick fix when everyone else is trying to do the same thing. Thankfully, by mid-morning, there was some relief as partial service slowly began to resume, allowing things to gradually get back on track, albeit with lingering delays.

It's worth remembering, the REM, particularly this Deux-Montagnes branch, is a huge investment in Montreal's public transit future. It promises speed, efficiency, and environmental benefits. So, when glitches like this occur, especially during peak travel times, it's not just an inconvenience; it can shake public confidence and underscore the immense challenges involved in rolling out and maintaining such complex infrastructure. Here's hoping the kinks get ironed out swiftly, because Montrealers are truly banking on this system to deliver.

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