Freight Car Friday #44 – Dry Branch Kaolin Tank Cars Posted on July 24, 2015 by Chris van der Heide This kaolin slurry tank car photographed by Blair Smith in the early 1990s in Sault Ste. Marie represents a General American (GATX) built car leased to Dry Branch Kaolin by GATX. Formerly Georgia Kaolin, Dry Branch Kaolin is now part of IMERYS.