CTLR INSTRUCTED 2 ACFT TO CROSS THE RWY WHILE ANOTHER WAS STARTING TKOF ROLL. CANCELLATION OF CROSSING WAS NOT HEARD RESULTING IN LESS THAN STANDARD SEPARATION WITH DEP ACFT.

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WE WERE OPERATING AS MLG X. AFTER LNDG ON RWY 35R AND CLEARING AT 2NE; WE WERE INSTRUCTED TO TAXI N ON LIMA TO TXWY 21 AND HOLD SHORT OF 35L; REMAINING ON TWR FREQ. THE TWR THEN CLRD 'COMPANY LGT Y AND COMPANY MLG X' CLR TO CROSS TO 35L AND CONTACT GND. LGT Y ACKNOWLEDGED AND THEN WE ACKNOWLEDGED. AFTER INITIALIZING OUR TAXI AND APPROX HALFWAY ACROSS THE RWY WE SAW THE LIGHTS OF ANOTHER ACFT APPARENTLY ON TKOF ROLL FROM 35L. WE CONTINUED OUR TAXI AND SAW MLG Z CLBING OVER OUR POS. ALTHOUGH THE DISTANCE WOULD BE HARD FOR US TO DETERMINE; HIS ROTATION WAS APPROX 4000' FROM OUR XING. AFTER CONTACTING THE TWR BY PHONE AND HAVING THE SUPVR REVIEW THE TAPES; IT APPEARS THE CTLR; AFTER CLEARING EACH FLT INDIVIDUALLY TO CROSS; THEN TRANSMITTED; '(COMPANY LGT Y) AND (MLG X); HOLD SHORT.' WE DID NOT HEAR ANY TRANSMISSIONS DIRECTED TOWARD COMPANY MLG X FROM CLR TO CROSS UNTIL CONTACTING GND ONCE ACROSS. HAD THE SECOND CALL BY THE TWR BEEN DIRECTED TO COMPANY LGT Y AND COMPANY MLG X WE COULD HAVE AVOIDED THE INCURSION; BUT WE WERE NOT IN POS TO LISTEN FOR THE CALL SIGNS BEING TRANSMITTED TOGETHER RAPIDLY. SUPPLEMENTAL INFORMATION FROM ACN 81473: I CALLED BACK LATER AND FOUND THAT BOTH COMPANY LGT Y AND MLG X HAD BEEN CLRD TO CROSS RWY 35L AT JUST ABOUT THE SAME TIME THAT AN AIRPLANE HAD BEEN CLRD FOR TKOF.