Aging equipment is to blame for three unexpected shutdowns of the O-Train within the last month.
"Those signals date, I think they are over 30 years old. So you have everything from wiring issues to glitches in them," explained Transit Manager John Manconi.
They will be replaced as part of the $60 million upgrade to the O-Train, that will eventually increase service to every eight minutes, up from the current 15 minute frequency.
Councillor Diane Deans added that the tracks are a hub for overnight activity. Bus drivers are being taught how to drive the trains, ahead of that increase in service.
An automated system is also being installed to allow drivers know the location of the other trains and when there is clearance to begin the route.
Currently, operators have to radio each other to get the all clear.