The light rail lines planned for Eglinton Finch are expected to be completed by 2020, along with the replacement and extension of the Scarborough rail line.
The Sheppard East light rail line is expected to be finished a year later.
Transportation Minister Bob Chiarelli says the province won't back the new OneCity transit proposal brought forward from Toronto Transit Commission chairwoman and opposed by Mayor Rob Ford.
He says the idea would require legislative changes and the congested city can't afford any further delay.
Chiarelli says the plans to expand transit have already been mired in contentious discussions between Ford — who wants to build more subways — and city council.
The province has committed $8.4 billion towards the transit plan.