I was messing about with the Combine ZM freeware for bogding an apparent increased depth of field. It sort of works OK, but is rather prone to artifacts, so gave up and simply manually stacked the 3 different files (same image, focussed on three different key areas, ie, car, loco, shed), adjusting the images so thay match up (as you focus in closer you get a slight zoom, effect) size wise. I then deleted the out of focus bits as I built up the layers starting from the rear.