On a hazy afternoon a westbound BNSF unit grain train approaches the grade crossing at Amboy, California. It had nine locomotives: four up front, three at mid-train, and two at the tail end.
John, your question about weight is more or less answered in a viewer comment on this page of my Flickr account:http://www.flickr.com/photos/listorama/5281931578/ . (Scroll down to the third comment by Holloran Grade.) He got the information by making an inquiry on a railroad forum page.