The Reading RR stretched and insulated 10 old 40 foot boxcars from the XMy class (RDG 106000-799, 107000-499) into a new RBa class. These cars went to Conrail and were given the class BR55C. These cars were rated at only 50 tons and there was only 5 left by 1981. The class BR55C was also given to RDG 19700-19789.
