Only a few rush-hour trains turn at Oakville. The majority now run to/from Aldershot offering what is essentially an every half-hour service throughout the day.

http://www.gotransit.com/timetables/...814/Table1.pdf

As the OP said he is coming from Detroit and Aldershot is very easy to reach by merging onto the 403 near Woodstock and exiting at Waterdown Road......GO Aldershot is right there.......straight ahead.

https://goo.gl/maps/RhrXA

But as Blackjack-21 said......parking can fill-up fast early in the day.