Tim Hardwick, MacRumors:

Riders in the Washington, D.C. metropolitan area should now be able to add their reloadable SmarTrip fare card to the Wallet app, and simply hold their ‌iPhone‌ or Apple Watch near a contactless payment reader at Metrorail stations or on Metrobus buses to pay their fare.

Huzzah! Can’t wait to give this a try. Great implementation. No need to wake your iPhone. No need for Face ID.