Yeah, I believe it could happen as well, but find it confusing when the dog was said to be that close to the tracks, the person was not. I wonder who determined the dog actually dragged the person off the tracks, and how, or did they just find the person near the track, with bite marks on their clothing or something? Maybe the dog was just hungry, or wanted to go home, who's to say the person didn't just collapse on the side of the tracks and the dog didn't drag her at all?
Oh well, in the long run it doesn't matter, I just don't care for fantastic stories that can't be proven.