I commute very irregularly with the SBB (Swiss Railway) but I was very interested a couple of weeks ago to see if people actually use it, so I went to our local train station (not too big but very well frequented) and indeed in an hour of sitting relatively close to the ticket machine i saw two people purchasing Bitcoin.
(I obviously didn't look at the transactions, but it was easy to spot, as they pull out there phone and open bitcoin wallets as exactly described by @swissclive )

Really, quite a fascinating scenery to see people buy Bitcoin "out in the open"

@swissclive Thanks for the "How" to, its really practical for people who never did it, and to bring awareness that it exists.