DH8 CAPT TAXIED TO THE CUSTOMARY TKOF RWY ON THE CUSTOMARY ROUTING. CTLR HAD CLRED HIM TO A DIFFERENT RWY VIA A DIFFERENT RTE. HE HAD A RWY INCURSION.

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PAX LOADED; RECEIVED TAXI INSTRUCTIONS. TAXI TO RWY 27R; CLR TO CROSS RWY 35. THIS IS A VERY; VERY UNUSUAL TAXI INSTRUCTION. RWY 27R FULL LENGTH IS HARDLY USED FOR TKOF. I PERSONALLY; IN 8 YRS OF FLYING IN AND OUT OF PHL; HAVE DONE SO ONLY ONCE. THE NORMAL INSTRUCTIONS THAT WE RECEIVE: TAXI TO RWY 27L; CLR TO CROSS RWY 27R. THIS IS WHAT I BELIEVED THAT I HAD HEARD. I CHKED FINAL FOR RWY 27R AND NOTICED A PLANE A FEW MI OUT SO I PICKED UP THE TAXI SPD SLIGHTLY. AS WE NEARED THE HOLD LINE FOR RWY 27R; THE FO CALLED MY NAME RATHER LOUDLY; SO I JUMPED ON THE BRAKES. AT THIS POINT WE HAD CROSSED THE HOLD LINE FOR RWY 27R BUT HAD NOT ENTERED THE RWY. I THEN NOTICED A PLANE IN POS ON RWY 27R. GND ASKED IF WE COULD DO A 180 DEG TURN. WE SAID YES; AND DID SO IMMEDIATELY. THE PLANE IN POS WAS THEN QUICKLY CLRED FOR TKOF. I THEN QUESTIONED THE FO WHERE WE SHOULD HAVE GONE AND HE TOLD ME. WE THEN TAXIED TO RWY 27R WITHOUT INCIDENT. I APOLOGIZED TO GND FOR THE MIX-UP AND HE SAID IT WAS NO PROB. THE FACTORS: I HEARD WHAT I HAD EXPECTED TO HEAR INSTEAD OF WHAT WAS ACTUALLY SAID. MORE CARE MUST BE TAKEN TO LISTEN TO TAXI INSTRUCTIONS. NEVER ASSUME. SINCE I HAD ALWAYS TAKEN PRIDE IN BEING VERY SAFETY CONSCIOUS; THIS HAS SERVED TO HEIGHTEN MY SITUATIONAL AWARENESS.