Toronto Transit Commission commuters could see an additional 30 new streetcars on the roads by the end of the year.

On Monday, the TTC's Chair Josh Colle told reporters that Bombardier has agreed to a revised delivery schedule for the new vehicles.

"We have paid Bombardier $1 billion; we need to get those cars on the road," Colle said on Monday. "I'm glad to see that they have given a revised delivery schedule, but at the same time, I am going to push for more of those cars. They have our money in hand and they should be delivering them."

Bombardier was originally supposed to deliver 43 new streetcars by last December to replace some of the TTC's old fleet of vehicles. But the transit agency has only received four -- three of which have been put into service.

Colle did not say if Bombardier will be penalized for the slow delivery of the new streetcars, but said he is "looking at the contract very closely."

He added the TTC will continue to push Bombardier and "use any of the leverage or levers we have in the contract" to ensure the timely delivery of the new streetcars.

A labour dispute in 2014 is partly to blame for the delayed delivery of the streetcars, but the TTC previously said the company was already behind schedule prior to the strike at its Thunder Bay, Ont., plant.

In 2009, the City of Toronto ordered 204 new streetcars from Bombardier at a cost of $1.25 billion.

All of the new vehicles are expected to be delivered by 2019.

TTC CEO Andy Byford previously told reporters he expects Bombardier to meet that deadline.