Passnet cards

When your Passnet card has less than a full ticket’s worth of value, you can slot it into the ticket machine and make up the difference in coins to buy a ticket.
You can use up to two Passnet cards at a time this way.
For example, you need 190 yen ticket and have a Passnet card with 40 yen left on it and one with 60 yen on it.
Insert one passnet card, then the other. The ticket machine will register 100 yen. Add 90 yen in coins, and the machine will give you a 190 yen ticket, plus your two Passnet cards (now completely empty).