In your photo above:
The top frame is supposed to represent the Commonwealth T60C frame with Timken roller bearings, used on engines 600-610. It should have hump over the middle axle like the one below.
The bottom frame is supposed to represent the Commonwealth T95 frame with SKF roller bearings, used on engines 611-613.
Here are some drawing numbers that you can search for if you go to the NWHS archives: 1941 tender DS00047, T60C truck G38975, 1950 tender DS00050, T95 truck G42810.