since we are talking about the IC cards... got couple of questions here:
1) each passenger is required to have a separate card? or I can pass the gate, hand the card to my child and she use the same card to go through?

2) Osaka has a "Kansai onepass" card (http://kansaionepass.com/kf_pr/kf_pr_en.html), which is a version of IOCCA with some local attraction discounts. I know IOCCA can work in Tokyo, but this onepass only mentions kansai so I wonder whether someone used this before in other areas... I probably will spend all the Y3000 initial load in kansai, but if it works in Tokyo I don't need to buy another IC card.