Can't find much info only that they had the numbers 78000-78049. Also found a photo. It's sort of bad, but it's the only one I can find right now:
http://www.railgoat.railfan.net/photos/ ... odgers.jpgEdit: They were 40 feet long and had a capacity of 4600 cubic feet. They were built by Thrall in 1962.
As far as I know the SSW never had 100 ton Bethlehem Hoppers. Talking about the Coal Hoppers correct?