Nfc RFID question?

Hello I have a nexus 6 phone and live in the DC metropolitan area, I use public transit a lot and found out something kind of interesting. I got a case for the phone wallet case and put my transit card (smart trip) and my phone when all wonky with beeps and bloops that come when I use nfc. It never read anything but it gave me the idea, because DC metro is looking for a new technology due to the company that makes the cards is kia, nfc like Google wallet and apple pay to pay the fare for public transit. Just a thought I have no knowledge on radio technology like this could it be done?