Haha, I saw the trailer for Unstoppable at some movie about a month ago, and I couldn't help but laugh. Of all the vehicles to make threatening, why a train...? It really is a laughable premise for a serious action movie, and that real life video was comical in showing how just wacky it really is. "What do we do?" "I don't know... Shoot at it...?" A train just seems like such a controlled element. It reminds me of a line from Wes Anderson's The Darjeeling Limited (which is about a train ride across India) where the characters wake up one morning to find that the train has stopped moving because they got lost, and one off them says "How can a train be lost...? It's on rails..."
I'm sure Hollywood has been loosely basing films for a while on real life incidents that weren't really a big deal, and will continue to do so for marketing reasons. Wasn't The Exorcist based on a small newspaper blurb, that wasn't actually based on anything of substance, then got to use the "based on a true story" line?
At this point, I'm not sure what's worse; basing a film on a minor news event then exaggerating it immensely, or basing an entire film on a single panel newspaper comic: