CARGO B757 CAPT INADVERTENTLY STARTED TO ENTER CLOSED TXWY WHILE XING RWY DURING TAXI OUT; RESULTING IN ANOTHER ACFT BEING SENT AROUND. THE CAPT MADE 180 DEG TURN ON RWY TO FIND PROPER EXIT TXWY.

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WAS TAXIING OUT OF CARGO RAMP ON TXWY M APCHING RWY 5 GND CTL STATED; 'ACFT ON 4 MI FINAL; YOU ARE CLRED ACROSS RWY 5; TURN R ON TXWY A TO RWY 5.' IN A HURRY TO CROSS RWY; I (CAPT)) SAW YELLOW TAXI LINE BEAR R AND PAVEMENT OF WHAT LOOKED TO BE TXWY OFF TO MY R ACROSS THE RWY. THE ANGLE WE WERE AT MADE THE BLUE TAXI LIGHTS OF TXWY A APPEAR TO BE FOR THIS TXWY. I TURNED R BUT AS I CROSSED THE CTRLINE OF RWY 5 I SAW IT WAS AN OLD CLOSED TXWY AND AT THIS POINT COULD SEE THE YELLOW X AND RED CLOSED SIGN. I IMMEDIATELY MADE A R 180 DEGS ON THE RWY AND NOTIFIED GND OF MY MISTAKE. WE EXITED THE RWY AT TXWY M; BUT TWR HAD ALREADY ISSUED GAR INSTRUCTIONS FOR ACFT Y. WE WERE PROBABLY ON THE RWY FOR 15-30 SECONDS. AFTER TURNING AROUND ON THE CARGO RAMP I PROCEEDED BACK TO RWY 5 HOLD LINE ON TXWY M; WE WERE LATER GIVEN INSTRUCTIONS TO CROSS AND THEN TAKE OFF WITHOUT INCIDENT. GND CTL DID NOT APPEAR UPSET OVER THE ISSUE. CAUSES: UNFAMILIAR WITH ARPT; NIGHTTIME (RESTR VISIBILITY) LACK OF YELLOW FLASHING LIGHTS TO SIGNAL CLOSURE OF TXWY AND RUSHED INTO XING AN ACTIVE RWY. I SHOULD HAVE NOT ACCEPTED CLRNC; STOPPED AND WAITED FOR MORE SPACING.