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Railbox 50 foot box car:  Rail box was a private company (RBOX call letters) that was owned by most of the
major railroads in the 70's.  RBOX provided a pool of box cars available to whichever road needed it next.
They were very common on the rails in the 70's and 80's.  You can still see them out there today.  A Chessie
Era layout needs to have some of these.