Those (converted wood rack) chip cars were discussed in a TIES article years ago. Maybe someone (Bill Schafer) can tell us which issue?
PS They never would have traveled to Columbus, GA. Unloading them required special equipment, a hydraulic ram that traveled beside the car and pushed the chips out of the other side. As ex wood racks, they had a solid floor. A chain hoist was used to open the lower sides of the car. Because of the way chips pack, when the side doors were removed, very few fell out. (That is why "modern" chip hoppers are wider at their side sills than at their top cords.)
The operator rode the end of the ram as it moved along the car and pushed the chips out. Only Champion Paper in Canton (and Savannah?) had the equipment so they would never have gone to Columbus.