Cary is fortunate to have the Metra Train line that can take you downtown Chicago east or as far west as Harvard Illinois. Below are links for the Metra for train schedules http://metrarail.com/content/metra/en/home/maps_schedules/metra_system_map.html

and for the commuter parking locommuter parking lot https://il-cary2.civicplus.com/531/Commuter-Parking-Lot