aidanc, what do you suggest travelers from US do w.r.t. prevent the risk of getting stranded at unmanned gas station, toll booths or train stations in Europe because the machines can only accept smart chip cards?

Is there a place one can buy certain cash cards (or so called prepaid cards) that are compatible with chip & pin requirement, say in $50 or $100 denominations? I would not necessary care for personalized PIN in such cards, i.e., concern for lost or theft, is only secondary to be able to pay and go on with my traveling.