Scrapiron-- The early C&O H-8's had the usual 3-axle Buckeye equalized truck on the front of the tender, and a 4-axle Buckeye equalized truck on the rear-- this rear truck was a rather complex arrangement. IIRC, the last C&O order of their final six engines had a rigid frame truck with the 4 axles riding in individual rigid pedestals, loaded by individual springs.
After this last C&O order was complete, the entire Virginian order of nine such engines were built to much the same plan. Specifically, Virginia had not wanted the equalized rear Buckeye, as their road was of much heavier construction (built much later than C&O). VGN felt they would not have trouble with the less than ideal equalization in the rear. C&O did not object to this arrangement on their last six, and so the entire 15 engines built at this time had pedestal trucks at the rear of their tenders.
The VGN engines were somewhat heavier than these last six C&O engines because certain weight-saving measures taken with them (lighter rods, e.g.) were not applied to the VGN engines.
I think the 3-axle Buckeyes were retained at the front of all the tenders, but cannot recall this for certain. In any case, the upcoming Legacy model would have to have a change to a pedestal truck in rear to correctly represent the VGN engines, and also any C&O engines numbered in the last group of six. After all, Legacy engines cannot be wrong in the smallest detail, and this is a pretty big detail.
Hope this helps, Scher.
--Frank