Montreal's REM light-rail operator confirmed Wednesday that morning disruptions halted service between Brossard and Gare Centrale and that the system used to inform passengers experienced problems during the outages.
Sequence of incidents disrupted morning commute
Officials said the first interruption began at about 5:30 a.m. when an equipment problem on the track prevented trains from exiting the maintenance centre, stopping service on the line serving Brossard and central Montreal. An attempt to resume service roughly an hour later did not go as planned and led to the evacuation of some trains, expanding the disruption to Côte-de-Liesse station.
Operator Pulsar reported that partial service between Gare Centrale and other branches was restored by 8:30 a.m., and the entire network was back in operation by about 9:30 a.m. That relative calm was short-lived: around 45 minutes later another interruption occurred between Panama and Gare Centrale after a truck struck an overpass used by the REM near Gare Centrale.
Operator acknowledges communication failures
At a news conference held in the afternoon, Pulsar's communications director acknowledged that the technology used to pass messages to riders "was not working properly" during the morning's rolling disruptions and long delays. The company said the initial fault stemmed from routine overnight maintenance and that it is investigating exactly what failed.
"the communication system used to relay information to passengers was not working properly"
Pulsar said it will implement mitigation measures to reduce the risk of similar incidents happening in future maintenance operations. The operator apologised to affected passengers and said it is reviewing processes related to overnight work.
Local consequences for Brossard riders
For commuters who rely on the REM to cross the Champlain Bridge corridor into downtown Montreal, the stoppage meant significantly longer travel times and uncertainty during the morning peak. Evacuations and rolling interruptions can push riders to seek alternate options — buses, carpooling or Métro connections — stretching capacity on other parts of the region's transit network.
- 5:30 a.m. — Service halted between Brossard and Gare Centrale due to equipment breakdown on track.
- ~6:30 a.m. — Unsuccessful restart attempt prompted train evacuations and widened the disruption.
- 8:30 a.m. — Service partially restored on some branches.
- 9:30 a.m. — Full network reported operational before a separate incident later in the morning.
- ~10:15 a.m. — Another interruption after a truck struck an overpass near Gare Centrale, affecting service between Panama and Gare Centrale.
| Time | Event |
|---|---|
| 5:30 a.m. | Service stopped between Brossard and Gare Centrale — equipment breakdown on track |
| ~6:30 a.m. | Failed restart; some trains evacuated; disruption expanded |
| 8:30 a.m. | Partial restoration on some branches |
| 9:30 a.m. | Network reported working; then separate interruption later |
Officials described the initial fault as related to routine maintenance conducted overnight Monday. Pulsar said it is working to determine precisely why maintenance activities led to the failure that immobilized vehicles in the maintenance centre.
Beyond the immediate inconvenience for commuters, the sequence highlights two separate vulnerabilities for the REM: mechanical or systems failures tied to maintenance, and exposure to third-party collisions with infrastructure. The operator said it will pursue measures to prevent a repeat of the maintenance-related communication breakdown and will continue assessing the structural impact of the truck strike near Gare Centrale.
Riders are encouraged to follow official REM channels for real-time updates. Pulsar said it will provide more information as its investigation proceeds and as mitigation steps are developed.
