Watch Mickey's Choo-Choo for Free: How to Stream the Movie Online at 123Movies. . Mickey is a railroad engineer with an anthropomorphic locomotive. He feeds the train (coal), then feeds his dog, then makes lunch for himself. Minnie drops by and plays a tune on her fiddle while Mickey dances. After lunch, the train has trouble climbing a hill, and the last car with Minnie aboard detaches and runs away.