AN SF340 PIC RPT ON A RWY INCURSION AND A POTENTIAL GND CONFLICT WITH DEP ACFT WHEN HE COULD NOT TAXI PAST THE HOLD LINE OF THE ACTIVE DUE TO GND TFC AT PHL; PA.

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WHILE TAXIING ACR FLT XXX AT PHL AFTER ARR; PHL TWR ADVISED US TO FOLLOW AN ACR B737 XING RWY 9L (THE ACTIVE DEP RWY) AND CONTACT RAMP CTL (130.05). WE WERE UNABLE TO COMPLETELY CLR THE TAIL OF OUR ACFT OVER THE HOLD LINE DUE TO THE PRESENCE OF THE ACR B737 WHICH HAD STOPPED IN FRONT OF US. I COULD SEE AN ACFT BEGINNING ITS DEP ROLL ON RWY 9L AND WAS UNCOMFORTABLE SINCE MY ACFT WAS NOT YET COMPLETELY OVER THE HOLD LINE DESPITE THE FACT THAT WE WERE WELL CLR OF THE ACTUAL RWY; AND BECAUSE FURTHER FORWARD MOVEMENT WOULD SUBJECT US TO POSSIBLE DAMAGE FROM JETBLAST. AFTER APPROX 30 SECONDS; WHEN IT WAS OBVIOUS THAT THE B737 WAS NOT GOING TO MOVE UP; I DID MOVE FORWARD AND AS MUCH TO THE R AS POSSIBLE TO CLR THE HOLD LINE AND MITIGATE JETBLAST WHEN THE B737 DID PWR UP TO MOVE. AT NO TIME DID RAMP CTL COMMUNICATE WITH US OTHER THAN TO ACKNOWLEDGE OUR PRESENCE INITIALLY. IN SUBSEQUENT CONVERSATION WITH ANOTHER ACFT; RAMP CTL SAID HE HAD TO TALK TO GND ABOUT 'A LITTLE INCURSION.' WE DO NOT KNOW IF THIS WAS IN REF TO US. IN MY OPINION; MOVEMENT ON THE GND AT A BUSY ARPT LIKE PHL IS A PUZZLE THAT DEPENDS ON A FLOW WHICH; WHEN INTERRUPTED; DOES NOT ALWAYS PROVIDE TIME FOR A PERFECT REMEDY. IN OUR CASE; THE SIT EXISTED FOR LESS THAN 1 MIN WHICH; IN HINDSIGHT; WOULD HAVE BEEN ENOUGH TIME TO COMMUNICATE OUR DILEMMA; BUT ALSO INVOLVED OBSERVING THE CIRCUMSTANCES; ANTICIPATING TIMELY FORWARD MOVEMENT; AND DIRECTING A LOW TIME FO; WHO HAD NOT BEEN TO PHL BEFORE; WHAT TO SAY. A CORRECTIVE ACTION COULD HAVE BEEN TO RETURN TO THE TWR FREQ WE HAD JUST LEFT MYSELF AND STATE THAT OUR TAIL WAS NOT YET CLR OF THE HOLD LINE. IN ADDITION; THE RWY 9L DEP SHOULD NOT HAVE BEEN CLRED FOR TKOF BEFORE WE WERE OVER THE LINE.