The (General Electric) Hi-Ad truck is also nicknamed -- among railfans -- the "Roller Blades" truck. I think some of the engineering for it was done by GE in collaboration with (or maybe even bought by GE from) Krupp in Germany. A lightweight version, with welded instead of cast frames, is used on several non-North American GE locomotives: some in Australia, and also the AC38 units used by Chinese railroads on the line to Tibet.
The other is (one of at least two versions of) the GE radial or steerable truck. EMD apparently got a radial truck into service first (on the SD70MAC), and GE then had to design something that had the same function, but was mechanically different enough from EMD's HTCR truck to not infringe on the patent. This design of truck is used on most of CSX's AC-motored GE locomotives (after the first 180 or so AC44CW -- the radial truck option was introduced after the start of AC44CW production) and many, though not all, of Canadian Pacific's GE locomotives. Apparently the radial truck needs a bit more maintenance than the conventional one (not surprising, given its greater mechanical complexity), and most railroads seem to have decided that the added cost isn't justified by its advantages (slightly better adhesion, and maybe a bit less damage to the track structure, on curves). KCS has at least some radial trucks on its big AC-motored GE locomotives, but a different design.
