2 ACR FLTS ARE ACCUSED BY GND CTL SUPVR OF XING RWY 12R WITHOUT CLRNC AT STL; MO.

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MAY/XA/01; ACFT XXX AT APPROX XA50 EXITED RWY 12L TO HOLD SHORT RWY 12R BEHIND ACR Y IN STL. WE READ BACK THE EXIT AND HOLD SHORT BEHIND ACR Y; CONTACTED GND 121.9. CONTACTED GND AND REPEATED HOLD SHORT RWY 12R. HELD WITH ACR Y IN FRONT FOR ABOUT 1-2 MINS; THEN CLRNC TO CROSS RWY 12R TO PARKING EXPEDITE. WE READ BACK 'FLT XXX ACR X CLR TO CROSS RWY 12R TO PARKING.' NO RESPONSE FROM GND UNTIL JUST PRIOR TO PULLING IN TO GATE AT ENG SHUTDOWN. THEY ASKED IF WE HAD RECEIVED A CLRNC TO CROSS THE RWY. WE RESPONDED YES WE HAD AND THAT WE HAD READ IT BACK TO THEM. THEY SAID THEY HAD TRAINING GOING ON AT THE TIME AND THAT THEY WOULD GET BACK TO US. CAPT SPOKE TO THEM AGAIN AND THE SUPVR TOLD HIM THAT THEY HAD REVIEWED TAPES AND NOTHING WAS GOING TO BE RPTED BUT JUST WANTED US TO BE AWARE OF DANGER OF XING RWYS WITHOUT A CLRNC. HE SAID TRAINING IN THE TWR/GND WAS TAKING PLACE AT THE TIME. NO ACTIONS REQUIRED. AT NO TIME WAS THERE ANY DANGER TO ANY ACFT OR PERSONNEL. SUPPLEMENTAL INFO FROM ACN 510969: ATC GND HAD TRAINEE WORKING FREQ. 3 OTHER ACR FLTS AND OUR ACFT WAITING TO CROSS RWY 12R AT STL AFTER LNDG RWY 12L. CTLR'S ATTEMPT TO CLR MULTIPLE ACFT ACROSS AT ONCE (STANDARD PRACTICE AT STL) MUFFED THE CALL SIGNS. THE READBACK WAS CLR; NO 'SLANG' AND NOT BLOCKED. AFTER READBACK WAS LONG SILENCE ON FREQ WHERE OPPORTUNITY TO CORRECT CLRNC WAS AVAILABLE. THIS WAS AN ATC DEV AS THE TRAINEE OR HIS SUPVR DID NOT CORRECT THE CLRNC READBACK.