

Arriving at work, Colson, a conductor, gets his orders for the day and learns he will be working with engineer Frank Barnes (Denzel Washington), with whom he has never worked before. He calls her but she refuses to even answer. Meanwhile, in the southern Pennsylvania town of Stanton, Will Colson (Chris Pine) gets up for work, stopping to surreptitiously watch his wife put their son on the school bus. In the Fuller yard in northern Pennsylvania, children arrive for a school field trip on rail safety.
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After panning across some idling diesel locomotives under the opening credits, the film begins with scenes at two rail yards in different regions of Pennsylvania run by the Allegheny and West Virginia Railroad (AWVR).The action lets up only with the final cue, "Who Do I Kiss First," underlying the end credits, by which time that unstoppable train finally must have been stopped.The synopsis below may give away important plot points.

Within individual cues, Gregson-Williams often goes back and forth, for instance in "Are You In or Are You Out?," alternating between the rapid electronic beat sections and brief slow interludes of strings to conform to the film's cutting. To do so, Gregson-Williams employs a string orchestra consisting only of violins, violas, celli, and basses, which mostly content themselves to provide wistful, somewhat ominous figures in support of the real engines of the music, the synthesizer sounds dominated by pounding percussion. Director Tony Scott's Unstoppable is an action thriller about a runaway train full of hazardous materials and the people who try to stop it from creating a disaster, and Harry Gregson-Williams' score naturally follows the contours of the editing, sometimes suggesting the concerns of the heroes ( Denzel Washington and Chris Pine), sometimes accompanying the train on its headlong journey.
