ACFT CLEARED FOR TKOF WITH TUG CROSSING RWY.

Narrative

I ASKED MY SECRETARY TO GET STANDARD CLRNC TO CROSS RWY 17 AT HIGH SPD TO XXX FLYING SVC. SHE READ A COMPLEX SERIES OF LIGHT SIGNALS TO ME INCLUDING A XING AFTER THE SECOND GREEN LIGHT. I DROVE THE TUG TO THE SIDE OF THE TXWY WHERE WE GOT A GREEN LIGHT; THEN TAXIED TO THE HOLD SHORT AREA ON HIGH SPD. I GOT ANOTHER GREEN AND TAXIED ACROSS THE RWY. WHEN IN THE MIDDLE OF THE RWY; I GOT A STEADY RED LIGHT AND THE TWR CLRED ME FOR TAXI AND THE ACFT FOR TKOF AT THE SAME TIME. SOLUTION: NO RWY XINGS IN OUR TUGS W/O A RADIO. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING: RPTR WAS PREPARING TO DRIVE A TUG TO THE OTHER SIDE OF THE ARPT. HE ASKED HIS SECRETARY TO CALL THE TWR BY TELEPHONE AND GET DETAILED INSTRUCTION ABOUT XING THE RWY WITH A TUG THAT DID NOT HAVE A RADIO. TWR'S INSTRUCTIONS WERE: PROCEED TO A POINT JUST SHORT OF THE HIGH SPD TXWY AND WAIT FOR A GREEN LIGHT FROM THE TWR. AFTER RECEIVING THE FIRST GREEN LIGHT; PROCEED TO THE HOLD SHORT LINE FOR THE RWY. THE SECOND GREEN LIGHT WAS CLRNC TO CROSS THE ACTIVE RWY. WHEN THE TWR GAVE THE FIRST GREEN LIGHT; THE TUG DRIVER DID NOT MOVE RIGHT AWAY AND THE TWR CTLR THOUGHT HE HAD NOT SEEN THE FIRST GREEN LIGHT. THE TWR THEN GAVE ANOTHER GREEN LIGHT FROM A DIFFERENT GUN IN THE TWR. WHEN THE RPTR SAW WHAT WAS FOR HIM THE SECOND GREEN LIGHT; HE STARTED ACROSS THE RWY. AT THE SAME TIME; THE LCL CTLR; THINKING THE TUG WOULD HOLD SHORT AT THE HOLD LINE; CLRED THE SMA FOR TKOF. WHEN THE LCL CTLR DISCOVERED THE TUG XING; AN ABORT ORDER WAS GIVEN TO THE SMA. THE SMA ROLLED ONLY ABOUT 200' AND WAS NEVER IN DANGER OF HITTING THE TUG. THE POINT OF CLOSEST PROX WAS APPROX 2500'.