At a Pennsylvania rail yard, some clueless workers let an unmanned train get loose, and the thing is soon hurtling across the countryside loaded with toxic materials and heading for the city. An engineer and conductor are the only two with a chance of stopping the careering locomotive. Apart from ‘will they wont they?’ that’s pretty much it plot wise, but Unstoppable is a nicely paced action peril movie, and while still pretty ludicrous it’s a step up from Tony Scott’s slaughter of ‘Pelham 123’.