In 2097 on the track select it showed the class emblem coloured bronze, silver or gold if you had acquired a medal on that track, I imagine the same is probably true in wo64 but likewise I've never played it.

Sausehuhn you are almost right, it's a mixture of wipEout 1 and 2097 tracks that have had their layouts altered, for example someone recently posted in the d/l content thread over in the PSP section that the Terrafumos track is actually Silverstream from wipEout but altered to be a lot easier. Oh and it had graphics that were inferior even to wipEout 1 even though it came out after 2097 as the Psyggy staff were unfamiliar with the N64 and of course it simply couldn't push as many polies as a PS1 could.