The Agence metropolitain de transport unveiled a $17-billion plan Tuesday to overhaul Montreal's public transit system by the year 2020.

The project includes expanding several metro lines and improving train service across its network, including through the West Island.

The AMT said that 500,000 more people in the West Island use commuter trains than they did five years ago, and those numbers are only going up.

"Since we've put the brand new double-decker trains, we see an increase every month," said AMT President Joel Gauthier. "We had a 19 per cent increase in September in the ridership, so we see there's an appetite. People love their trains."

The AMT has not revealed how it plans to pay for the project and is considering a gas tax and public-private partnerships.