Every year needs a runaway train movie, and ‘Unstoppable’ is the one for 2010. It’s also an environmental movie of sorts, since the runaway train is carrying a cargo a toxic chemicals threatening to decimate everything in its path. Directed by Tony Scott, this tense action thriller finds an engineer and his conductor in a race against time to bring the train under control before it derails on a curve and causes a catastrophic toxic spill. And oh yes, 150 kids on a field trip are on a separate locomotive smack in the train’s way. Look for plenty of thrills, spills and explosions in this movie starring Denzel Washington, Chris Pine, Rosario Dawson and Kevin Chapman.