It's official: "Train to Harbin," first published in The Hudson Review, is included in this year's O. Henry Prize Stories (thank you Laura Furman!). The story is featured on LitHub (thank you LitHub!). You can read it here. The list of all twenty O. Henry Prize winners can be found here. The anthology is due out in September.
"Train to Harbin" is a companion story to "The Visitor," which was included in the 2013 O. Henry Prize Stories anthology.