Unstoppable is a story of a runaway freight train, and the two men (Denzel Washington and Chris Pine) who attempt to stop it.
Veteran Allegheny and West Virginia Railroad (AWVR) engineer Frank Barnes played by Denzel Washington) oversees his co-worker, freshly hired conductor Chris Pine who plays Will Colson , as they use AWVR to pick up several train cars outside Stanton, Pennsylvania.
Will picks up five cars too many, which they realize only after they have left the train yard. Although Will demands that they roll back and uncouple the extra cars, Frank continues north on the main line with the extras in tow.
Meanwhile, in a rail yard within the northern town of Fuller, two AWVR hostlers, are ordered by Fuller operations dispatcher to move a freight train led by locomotive #777 (nicknamed “Triple Seven”) off its current track to clear the track for an excursion train carrying schoolchildren.
However, one hostler named Dewey played by Ethan Suplee, attempts to take shortcuts and unfortunately leaves the hoses for the air brakes disconnected for the short trip.
The team gets a notification that the bus of school kids is coming on the same direction they loose train is going.
The train is running by itself and they have to do everything in their power to stop it , or the innocent kids will lose their lives.