RWY TRANSGRESSION BY A GLIDER TOW PLANE CAUSING ANOTHER TOW ACFT TO GAR AT A NON CTLED ARPT.

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I WAS TOWING GLIDERS AT KELLY AIR PARK (N OF COLORADO SPRINGS; CO) FOR SBF. AS USUAL; ON WK-ENDS AT KELLY AIR PARK; THERE WAS A CONTINUOUS LINE UP OF GLIDERS TO BE TOWED. THE USUAL SYS IS FOR SBF GLIDERS TO STAGE ON THE W DIRT TXWY (PARALLEL TO THE ASPHALT MAIN RWY) AND WHEN THE TOW PLANE IS DOWNWIND THE GLIDER IS HAND MOVED TO THE ACTIVE (ASPHALT) RWY; AWAITING TOW. I USUALLY; (CONSISTENT WITH THE APPROVED PROC) LAND ON THE E DIRT PARALLEL TXWY AND THEN BACK TAXI ON THE ACTIVE RWY TO PICK UP THE NEXT GLIDER FOR TOW. A SECOND TOW PLANE WAS ALSO OPERATING AT THE AIR PARK ON SUN; TOWING A PVT GLIDER; THE PLT OF THE OTHER PLANE IS A PROFESSIONAL AND WE ALWAYS MAINTAIN RADIO CONTACT TO INSURE A MUTUALLY SAFE AND EFFICIENT TOWING OP. THE RWY INCURSION SIT BEGAN WHEN I ENTERED THE 45 DEG R DOWNWIND (PWR ACFT PATTERN) TO RWY 35. AFTER MAKING A 45 DEG RADIO CALL; I ENTERED THE R DOWNWIND TO THE E TXWY PARALLEL TO RWY 35. ABOUT THAT TIME; PLT Z; WHO WAS IN HIS GLIDER; ANNOUNCED OVER THE RADIO THAT HE WAS ON L DOWNWIND (STANDARD GLIDER TFC PATTERN FOR RWY 35) AND THAT HE WOULD LAND ON THE E TXWY. I THEN ASKED PLT Z; ON THE RADIO; IF HE WOULD LIKE TO LAND FIRST. PLT Z SAID 'NO' THAT I COULD LAND FIRST. AT THIS TIME I PROCEEDED TO LAND ON THE E TXWY. AFTER LNDG; I CLRED THE PARALLEL TXWY AND HELD SHORT BTWN THE E TXWY AND THE ACTIVE RWY. AT THAT TIME PLT Z ANNOUNCED THAT HE WAS LNDG ON THE E TXWY (IN HIS GLIDER) AND THAT IT WAS NOT NECESSARY FOR ME TO HOLD SHORT OF THE ACTIVE RWY. AS I TAXIED ON THE MAIN RWY; I SAW PLT Y TOW PLANE ON FINAL. PLT Y HAD BEEN WATCHING AND MONITORING THE RADIO; SO HE IMMEDIATELY INITIATED A PULL-UP AND GAR; BEFORE I COULD EXIT ON THE GRASS. AT NO TIME WERE THE 2 TOW PLANES CLOSER THAN 500 FT. I IMMEDIATELY RECOGNIZED THE RWY INCURSION AND XMITTED MY APOLOGY TO PLT Y. I THEN CONTINUED TO BACK TAXI ON RWY 35 AND EXITED THE RWY AT THE APCH END TO LET PLT Z LAND. I THEN CONTINUED TO TOW FOR THE REST OF THE DAY. IN RECONSTRUCTING THE SIT; THE MOST LOGICAL EXPLANATION FOR THE UNFORTUNATE INCURSION WAS; IN PART; THE XMISSION FROM PLT Z WHICH STATED 'THAT I NEED NOT CONTINUE TO HOLD SHORT.' THIS XMISSION MOMENTARILY CAUSED A LAPSE IN MY SITUATIONAL AWARENESS OF THE OTHER TOW PLANE. RECOMMENDATIONS: CONTINUED AND IMPROVED SIT AWARENESS OF ALL TFC. RESIST ANY DISTR IN THE FORM OF RADIO OR OTHER INTRUSIONS. CONSIDER A REVISION IN THE KELLY AIR PARK RULES AND REGS TO ALLOW TOW PLANES TO TAXI BACK ON THE E TXWY TO THE APCH END AND THEN CAREFULLY PULL IN FRONT OF THE WAITING GLIDER FOR HOOK-UP. THIS WILL REDUCE TOW PLANE BACK TAXIING AND ALSO INCREASE THE EFFICIENCY OF THE TOWING ACTIVITY.