During some research I was conducting regarding flat cars, I came across an interesting photo that might be worth a comment. Recently there was some discussion about the placement of empty flat cars in trains. The photo on pg 256 of Motive Power of the UP shows two 4-12-2's pulling a frt up Sherman Hill. It is noteworthy that both engines are working hard from the evidence of smoke being produced. The photo was taken by noted RR photographer Richard Kindig and the caption notes that the train was a "mile" long. We don't know that, of course, but we can assume that since the train was requiring such an effort by the two engines that maximum train resistance for the engines was likely being encountered. The first car was an empty 40 ft flat car followed by an empty 53' flat car.
