Frank Barnes is a grizzled yard conductor with a knack for machines and a face carved by a lifetime of 2 a.m. shifts. Will Colson is the youngest engineer at the railyard, newly promoted and riding a fragile confidence he earned by the book. When the dispatcher realizes the train will plow through bridges and grade crossings, possibly detonating catastrophe, the railroad turns to its unlikely pair: Frank’s stubborn experience and Will’s bleeding-edge training.