It is not possible to buy/pay something at SBB with bitcoins and a customer needs to provide a mobile phone number/personal ID and is also limited to buy 5000 CHF per year due to anti money laundering rules.
Further information: http://www.sbb.ch/en/station-services/services/further-servi...
IMHO It's (just) a proof of concept of SBB to launch selling complex 3rd party products (think: platform services) using their ticket machines, not so much about Bitcoin.