The old equation of man-plus-locomotive has been a dependable one for the movies since Buster Keaton rode the rails in The General. (See also: Burt Lancaster in The Train, and Denzel Washington in Unstoppable.) The Commuter isn’t in that class, but there are worse tickets to punch, especially in January. Such a woeful time of year for new releases warrants repeating the old warning: If you see something, say something.