One thing wrong with the big A, according to old-time railbirds, is that it is too mechanized. Long Island's fancy new track, they say, is more like a supermarket than a proper mecca for horse fanciers.

Not so, says SPORTS ILLUSTRATED'S imaginative artist Roy Doty, a horseplayer who has had his fill of muddy paddocks, green infields and shady benches under the elms; the big A is not mechanized enough. Aqueduct, figures Doty, is already as outdated as a county fair track. What is needed now is the Super A, envisioned here with customers and horses alike riding a conveyer-belt maze toward a supermechanized future.