A legendary racetrack in NYC allegedly lost $280,000 in a brazen March armed robbery ... but law enforcement officials say they've now caught and arrested 2 suspects in the case.
The robbery, according to court docs obtained by TMZ Sports, went down at Aqueduct Racetrack on March 7 ... and officials say it all involved an elaborate scheme with an "inside man" at the track.
Officials in the docs say hours after the venue concluded its huge Gotham Day races ... two men held up three racetrack employees at gunpoint as they were transporting cash to a vault.