More than $600 million is being spent to make the city’s downtown transit hub more accessible, more up to date and more functional for the tens of thousands of people who pass through its doors each day.
While the work is taking longer than expected, the people making the changes happen say the public will be pleased with what results when it is all over.
"It's going to be much easier for people to get to and from the trains and it's going to make a complete difference in their life and they just have to be patient while we go through these construction difficulties," said Gary McNeil, the president of GO Transit.
The CBC's Shannon Martin got a first-hand look at the work being done underground. Click on the video above to see her report on the progress that is being made.