Vancouver does this too, at least on the SkyTrain. Very convenient when you're a visitor.

as does Chicago. Credit card or just any tap to pay card on your phone works tapping in and out.

	▲	jjice 10 hours ago \| parent [-]
		Boston was the last major city I saw to actually add this in the US (every other major city metro I've seen has it). Boston got it last Spring or Summer if I recall. The MBTA is a nightmare, but at least I don't have to reload my Charlie Card anymore...