Priyanka Chopra in a still from Citadel Priyanka Chopra and Richard Madden are strangers on a train, except they aren’t strangers, in the trailer of upcoming web-series Citadel which released today. Turns out, the two belong to a spy agency named Citadel but have no memory of each other or being spies at all, having had their minds wiped. A meeting on a train jogs their memories and some high octane action follows as well as some romantic frisson. Stanley Tucci appears in the trailer as a spymaster who presses Priyanka and Richard – or, to give them their screen names, Nadia Sinh and Mason Kane – back into the service of Citadel against a villain who aims to establish a new world order. Unsurprisingly, Priyanka is thoroughly badass who turns out to be as deadly as she looks. Much of the action takes place in a train, explaining why the release of the trailer was postponed from last week after the tragic train crash in Greece that claimed 38 lives. Watch Priyanka Chopra killing …