A train station has an automated ticketing machine. You use the touch screen on the right to buy a ticket. You must make three choices.
Choose the train network you want (subway or country).
Choose the type of fare (full or concession).
Choose a daily ticket or a ticket for a specified number of trips. Daily tickets give you unlimited travel on the day of purchase. If you buy a ticket with a specified number of trips, you can use the trips on different days.
The BUY button appears when you have made these three choices. There is a CANCEL button that can be used at any time BEFORE you press the BUY button.