This Saturday, Emily Blunt is hosting ?Saturday Night Live? to promote her new film ?Girl on the Train.? In a promo video promoting her appearance she and her co-star Beck Bennett shared a slice of pepperoni pizza. In the video, Blunt made a joke that she not only played the girl on the train, that she played the actual train as well. She stated, ?They had me in a motion-capture suit and all the choo-choo?s and the chugga-chugga?s are me.?