A massive train, its brakes screaming, hurtles into a car. A cacophony of sirens, helicopters, crackling walkie-talkies, and the whine of an electric saw that sheriff's deputies use to remove the car's hood blend in an awful and frightening mix. Paramedics work intently on a boy pulled from the wreckage, but to no avail. His body is moved, lifeless, to a stretcher. The action is riveting, and convincing. In seven minutes, It's Not an Accident, a film the Illinois Department of Transportation uses to teach new drivers about the grim realities of train crashes, tells a compelling story full of palpable grief. But the movie -- polished, edgy, realistic -- comes from an unlikely source: a class of high school students.