I bet this is not normal, but it seems other P32BWHs either have frame sag or it is not very noticeable.
www.railpictures.net/viewphoto.php?id=20249
www.railpictures.net/viewphoto.php?id=200500
www.railpictures.net/viewphoto.php?id=20249
www.railpictures.net/viewphoto.php?id=200500