I've never read an entire Stephen King book, but I have tried a few times! I got about a couple hundred pages into IT, I think. Apparently toward the end all the boys run a train on Beverly in order to free themselves from IT's grasp. It is a shame they excluded this scene from the movie.
It's in the deleted scenes on the DVD.
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DOOSH!
All the endings in Stephen King's movies suck. Just like IT being a spider which has no relavance to the story at all.