The head of Metrolinx says its next priorities are two new subway lines – the downtown relief line and an extension of the Yonge line north to Richmond Hill.

Bruce McCuaig outlined the details during a speech to the Toronto Board of Trade on Thursday, and said both lines will help commuters get access to the downtown core, explaining that an additional 3-million people will be using transit in the Toronto and Hamilton areas over the next 20 years.

The downtown relief line, running parallel to the Yonge line, be 13 km long and cost approximately $7-billion to build. It was originally scheduled to be built in 25 years, but Metrolinx has moved up the date by 10 years.

In addition, the plan includes light rail lines for Mississauga, Brampton, and Hamilton, plus improvements to Toronto, Halton, Peel and Durham.

The total price tag is approximately $34-billion, in addition to $16-billion already spent under a plan entitled “The Big Move”, passed in 2008.

Metrolinx is looking into who will pick up the tag for the project, with McCuaig noting teams are exploring what other world class cities have done to pay for transit beyond relying on government money.

Updates will be posted on the Metrolinx website on December 5, and public comments are welcome.

Metrolinx is the provincial agency responsible for regional transit.

Listen to Andy Byford, CEO of the Toronto Transit Commission, discuss the proposed subway lines with 680′s Momin Qureshi.