This is Toronto's main downtown train station. It's built in the style of similar large central train stations. It's where the Union Pearson Express runs from and there is also a TTC connection as well as go train lines and via rail departures. Overall a very busy terminal especially if you considered the go buses that run from outside.
Are usually come here for the union Pearson express. At the platform there is a Balzac's coffee shop. The coffee is not bad and the selection of scones and sandwiches is acceptable.