The STM says it has repaired five of the eight Azur trains that were damaged in the incident on Saturday that caused one of the worst metro shutdowns in recent memory.
The entire west end of the orange line was out of commission for 10 hours on Saturday afternoon and evening, after an Azur train scraped against the rails, damaging both the the train, and the signalling equipment running alongside the rails.
All 12 of the Azur trains that were in service at the time have been pulled until further notice.
The transit authority issued a preliminary report into the problem on Wednesday. It outlined some of the steps that were taken to identify and solve the problem, including sending the damaged pieces of equipment to Ecole Polytechnique for analysis, and running some of Azur trains along the orange line during the night on Tuesday to detect problems. They didn't find any.
STM technicians are continuing the investigation into the issue, carrying out further track inspections and analyzing video from cameras installed underneath the trains.
A statement from the STM says security of riders remains the top priority, adding "the metro system is a complex environment for which we have strict security protocols."
Meanwhile, you may actually see an Azur train rolling through the stations during the morning and evening rush hour on Thursday, but they will not pick up passengers. They'll be track-tested before rolling back to the garages for further inspections and repairs.
The report doesn't make it clear when the Azur trains will be put back into service. The STM says it will give another update on the situation on Friday.