SMT CROSSED RWY WHILE SMA WAS ON TKOF ROLL.

Narrative

I TAXIED SMT X FROM WALLACE FACTORY TO HOLD SHORT OF RWY 19L. I HAD ANOTHER SMT Y TAXI OUT FROM PHH FOR RWY 19L. I COORDINATED WITH LCL CTL TO TAXI SMT X ACROSS THE RWY. LCL CTL COULD NOT APPROVE THE XING; SO I DECIDED TO EXPEDITE MY GND TFC BY DIVERTING SMT W TO A DIFFERENT INTXN AND TAKING SMT Y AT PHH TO THE END OF RWY 19L. WHEN I CALLED SMT Y AT PHH I USED THE NUMBERS OF SMT X AT THE WALLACE INTXN AND TOLD HIM TO TAXI TO THE END OF RWY 19L. SMT X XED THE RWY WHILE SMA Z STARTED HIS TKOF ROLL. WHEN I NOTICED THAT SMT Y PHH WAS NOT MOVING; MY SCANNING CAUGHT SMT X XING AT THE INTXN. I IMMEDIATELY REALIZED MY MISTAKE AND SINCE SMT X WAS HALFWAY ACROSS THE RWY AND SMA Z WAS NEARLY 4000' DOWN THE RWY; I ELECTED TO LET SMT X CONTINUE ACROSS AND TOLD THE LCL CTLR TO LET SMA Z TAKE OFF; SINCE SMT X WOULD BE CLR BEFORE SMA Z BECAME A FACTOR. NO EVASIVE ACTION WAS TAKEN BY THE PLTS; NO OTHER ACTION BY ME WAS REQUIRED; EXCEPT TO NOTIFY MY SUPVR OF WHAT TOOK PLACE. I BELIEVE MY SCANNING HELPED PREVENT A MORE SERIOUS OUTCOME; BUT I MUST ENDEAVOR TO BE MORE POSITIVE IN XMITTING INSTRUCTIONS TO BE ASSURED THAT THIS WON'T HAPPEN AGAIN.