I seem to be missing some of my links that I had before.

And looking around in my two copies of Car and Locomotive Cyclopedia, I failed to find what I expected there as well. However, I did sort of re-find some of the sites I had once bookmarked. Along with the one Dave included above:
Amsted Rail / Griffin Wheels
AAR
Amsted irritates me as they've bought up a great many of the component manufacturers here. And they seem very protective about technical data. So it is difficult to find info now for many car and loco parts.
As to profiles, there are really only two that I have ever seen evidence of. The ones indicated in the AAR specifications linked above are the more common type, for both loco and car wheels. The wheel tread profile will remain the same for any size wheel really. It's just the web that gets elongated a bit for the larger diameter wheels.
While the bogie frames on the Class 59 appear to be EMD HTC-1 sideframes (it's stamped right on the side of the ones I saw on Brian Daniel's flickr site), that doesn't necessarily preclude them using 42" diameter wheels in the same sideframes. Larger diameters are preferred now as they theoretically increase the surface area in contact with the rail and therefor increase factors of adhesion.
I think what Mick might be noting on the gp60 wheel is shown in the link to this
wheel. It's the second wheel profile I have seen used. There is a reverse curve in the dishing of the wheel. I don't think it is shown in the AAR spec above.
One warning I like to give everybody is if you are looking for diesel data, I would avoid a site called the
Diesel Shop. They have a loco data section that looks promising but in fact has an awful lot of incorrect information. It always comes up on google searches but I ignore it now as I don't trust it at all to be accurate.
Doing all this on the fly and need to head back out. Hope some of this helps you along. I also have a pretty accurate wheel profile, developed from the AAR publication among others, drawn in CAD if that would be of any assistance to you. Ask away if you have any other questions and I'll respond as quickly as possible. I may be a bit delayed as we have our Labor Day holiday tomorrow so I'll still be busy with my girl.
Regards,
Jim