In lieu of buying additional replacements, NS has been selecting Top Gons to have body work and replacement tubs added. There is an article about the project in the Fall 2014 BizNS with a link below.
http://www.nscorp.com/content/dam/nscorp/bizns/2014-BizNS-Articles/fall2014/BizNS_Fall2014.pdf
Has anyone photographed or noticed these cars in service following release from the shop?