The Chualar bus crash took place on September 17, 1963, when a freight train collided with a makeshift "bus"— a flatbed truck with two long benches and a canopy— carrying 58 migrant farmworkers on a railroad crossing outside Chualar in the Salinas Valley, California, United States, killing 32 people and injuring 25. Because the vehicle was actually a truck carrying people in the back, rather than a bus, the crash is ranked as the deadliest automobile accident in U.S. history, according to the National Safety Council.