Everything I have failed me at an SNCB ticket machine in Belgium. Visa/MC acceptance logos displayed. Most cards said "technical problem" except my B of A Visa which said "Transaction refused by issuing bank" but B of A says they see no record of it.

Mag stripe would be pretty bad in the Netherlands. Many shops, including Starbucks, have the slot covered. In Starbucks case it's covered with a big no sign over a stripe card and "no magnetic strip". Yay for Capital One's "they have to honour all cards" argument. Chase Sapphire Preferred works fine there as no CVM.