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Toronto used to have a Trolley Bus system composed of 10 routes. However the system was eliminated in 1993 for a few reasons. The Trolley Buses and their infrastructure was old and actually costed more to maintain then the streetcars. It would have costed millions to fix and replace everything and at the time the TTC was under a budget crunch due to the recession at the time (and low ridership as well). As well things like Oil being still relatively cheap and the advent of CNG Buses (which themselves didn't last long in Toronto) all essentially brought down the trolley buses.
As well the system was essentially 2 independent systems that weren't linked together. There was the Lansdowne Division and the Eglinton Division. The TTC proposed converting the 32 Eglinton West into a Trolley Bus route to bridge the gap between the two divisions however this was obviously never built. They also looked at converting the 94 Wellesley, 75 Sherbourne and 78 Runnymede South into Trolley Routes while extending the 89 Weston all the way to Steeles; none of this happened either. To be honest even if the TTC had invested the money to revamp the system part of me doubts it would have survived anyways since only a year after the system was closed the Conservatives were elected in Ontario and promptly eliminated the Provincial Transit Subsidy which has forever hurt the TTC and its finances.