Paul Hillman wrote: "(This was all mentioned in the C&EIHS Volume 29:1"Flyer" Magazine
along with scale dwgs. of the prototype.)"
Tim O'Connor replied: (snip) "I am amazed you found a prototype forthe model! :-)"
I recall an article published in the model railroad press about
converting these generic gondola models, AAR class GB, with 8-panels
into general service gondolas, AAR class GS. I cannot recall the
specific reference possibly RMC.