When I was a Junior, racing USCF and Amateur Athletic Foundation races at the Balboa Park Velodrome in the late 80s, the loaner / rental bikes were Schwinn Madisons, with the white & black paint job and mostly with the OEM parts. (Sugino, SR, and Suntour, if memory will still serve.)

I raced 2 seasons on those Madisons, before getting my own track bike. (Unknown frame, Nervex lugs and longer geometry, raked fork with a brake hole, Schireen Weltmeisters tied-&-soldered to high-flange Campys, Vittoria Setas. As you might be able to tell, I still regret selling it over 30 years later.)

I don't recall any Olmos, but who knows?

--Shannon