Douglas,
Try the link below for more info on the Gramps tankcar at Joshua Tree & Southern. My good friend Terry Rider produces these under his company's Rio Grande Associates name and in fact delivered this very car to the JT&S. They are honies aren't they. Terry has produced some fantastic 1.5" scale and 2.5" scale narrow gauge equipment. Together with Jeff Smith (Branchline Trains) and Gail Gish they have put together a collection of really nice narrow gauge equipment.