The Ball That Stops Dead

A freight train with an enormous flat steel door on its rear car rolls down a straight track at $60$ mph. A drone chasing the train launches a perfectly bouncy ball forward at $120$ mph (measured relative to the ground), and the ball strikes the steel door head-on and rebounds elastically. Treat the train as immovably massive compared to the ball. What are the ball's speed and direction right after the bounce, as seen from the ground?