The going is a bit slow also because these are really old boxcars and my photo was not as detailed as I would have liked. So, to get them as correct as possible I spent several hours of research on what type of trucks (undercarriage) were on them so I could see more exactly what I should be painting. I am sure that a few railroad buffs will find some mistakes, but I have chosen some " artistic license" with some items--color for one. Most boxcars were painted  red due to the inexpensive red oxide pigment available at that time. Most of the yellow cars were "reefers"- refrigerator cars that had double hinged doors,   versus sliding doors.
    I  hope you enjoy the process, however long it takes. For those interested in more technical info,
the paper is Arches 140# cold press and the paints usually Winsor & Newton, Daniel Smith, and some Holbein colors. I use inexpensive Simmons brushes, with a couple of sable fine liners.