A special council meeting is being held to decide what kind of transit will serve the city's eastern reaches, and it's expected to continue into the evening.
At issue is whether to build a light-rail system or extend a subway line eastward.
The majority of councillors are expected to support light-rail transit, which they say is a cheaper option that would serve more people sooner.
An expert panel commissioned by council has endorsed light rail as the best option, but Mayor Rob Ford has said the panel is biased.
Ford has long opposed light rail and says he prefers subways, despite the high cost.
Last month Ford and his allies lost a crucial transit battle when council voted 25-18 in favour of a light-rail plan.
Ford insisted the vote was meaningless because the province would still go ahead with his subway plan.
However, Premier Dalton McGuinty has said he must respect council's decision on the future of the city's transit.
(680News, The Canadian Press)