The campground for San Onofre State Park is a long strip between the cliffs and the Amtrak line. It's a rather quiet train, not rattly like a freight train. It just rumbles through, almost like it's on tires.
I've been wanting to get a long exposure shot of the train zooming by, but I don't have a schedule handy. I was out shooting night clouds when I heard it coming and whipped the camera around into place. Gotcha!