Barclay World Arrival Mastercard
They support Chip and Pin technology, so will work in many train station ticket machines and the like. Most US credit cards with chips only support chip and signature technology, so they often won't work in the machines and you're stuck finding a manned ticket office.
Barclay has another card, the Arrival+, with greater perks but it has an annual fee. I'm assuming you'd want a no-fee one. If that's that case and you go to apply, make sure you are applying for the Arrival, not the Arrival+. Because the names are so similar, it's easy to end up on the wrong webpage.