Hi all,
  I just spent a couple of hours going thru a lot of the images in this collection
(and even saving a few).  As I was browsing the images one thing I noticed
was that a very high percentage of the flat cars did not have end numbers.
Some were even without -any- markings for anything (on the ends).
  Were these builder's photos and the end numbers would be added after
the RR took delivery?
                                                                                                  - Jim