yea, that is more broken up and different pitches. mine was a constant. it was actually very loud when i heard it, i heard it from inside my house and it didn't seem to be localized. later, the sound quited a bit and it seemed to come from the north. there is nothing over there but hundreds of acres of woods. we do have a railroad in a few towns over, but never in all the years i have lived here have ever heard of ever seen a train pull something on the railroad for an hour. so, i dunno...it was a neat experience none the less and got me to re-read the left behind series. :)