I was checking the MBTA site about the train and ticket purhases and it lists that you can purchase them in advance on the mobile app. I installed the app on my phone but when I click on the Gillette/Foxboro destination and South Station as departure it comes up no tickets are currently available. It is Sun Dec 8th the game I will be going to. if I am going to purchase a ticket the day of for the train how early should I arrive to South Station? Hoping that I do get a ticket as this will really suck not being able to attend the game.