Unionville GO Station

Its a ncie place and they have place for you to obtain a ticket when the booth is closed (after mornign rush).
They even have a spot for you to stand in it rains or snows. its not heated so dress for the weather.

Unionville GO Station is a train and bus station of the GO Transit system. It situates in a centralized location in the City of Markham.
The station offers 3 main services: train services, bus services and parking lot. The trains run on weekdays, southbound to Union Station of downtown Toronto in the morning during rush hours, and they run northbound to Stouffville in the afternoon during rush hours. There is no train services on weekend. The bus services run throughout the day, 7 days a week, to many locations. The parking lot is currently free for transit users. There is also a car dropoff and pickup area. There is a station building on site that opens from 5:30am to 9:35am on weekdays. The station offers ticket services and public washrooms.
I like Unionville GO station a lot because it is conveniently located, and it has the biggest parking lot of all GO stations in Markham. In addition, it has both train and bus services to downtown Union Station. There are many times that I have to work late in downtown and have to use the bus services to get back to my car. The trip, using dedicated bus lane on DVP and taking Hwy 407, is super fast and reaches Unionville in approximately 30 minutes during evening rush hours. It is faster than taking a taxi or driving.
Leaving the parking lot for home has always been a RACE. People literally run from the train to their cars to be the first few to leave the lot, just to beat the traffic gridlock to leave the parking lot. I shake my heads many times at the scene. As well, parking has been tight with the increased transit usage.