AN ACR LGT TAXIED ACROSS THE HOLD SHORT LINE APCHING A RWY.

Narrative

AFTER LNDG IN PHL ON RWY 9R AND CLRING; WE WERE TOLD TO TAXI VIA TXWY W AND TO HOLD SHORT OF RWY 9L WHICH WAS READ BACK (BY THE FO) AND ACKNOWLEDGED BY THE CAPT. AT THIS TIME I WAS FINISHING THE AFTER LNDG CHKLIST AND NOTIFYING THE COMPANY THAT WE WERE ON THE GND AND RECEIVING GATE CLRNC. THEN I LOOKED AT MY ARPT DIAGRAM CHART. WHEN I LOOKED UP; WE WERE APCHING THE RWY AND THE FO AND THE TWR ALMOST SIMULTANEOUSLY REMINDED THE CAPT TO HOLD SHORT OF RWY 9L WHICH THE CAPT HAD JUST STARTED DOING. THE HOLD LINE IS FADED YELLOW WHICH IS EXTREMELY HARD TO SEE AT NIGHT AND THERE ARE NO LIGHTED SIGNS THAT YOU ARE APCHING THE RWY (NO RWY SIGNS THAT ARE LIGHTED). BRAKING WAS SLIGHTLY HARDER THAN NORMAL SO WHEN A DEPARTING WDB ROTATED 100 YARDS OR SO BEFORE US; SOME PAX HAD THOUGHT WE HAD A NEAR MISS AND EXPRESSED CONCERN WHEN THEY DEPLANED. ALTHOUGH WE KNEW TO HOLD SHORT OF RWY 9L; WE MAY HAVE CROSSED THE HOLD SHORT LINE A LITTLE SINCE IT WAS ALMOST IMPOSSIBLE TO SEE. BEING A LITTLE CLOSER TO THE RWY THAN NORMAL; AND THE POSITIONING OF THE TXWY; LED TO THE PAX CONCERN. GND TXWY AND RWY LIGHTING SIGNS DEFINITELY NEED IMPROVEMENT IN PHL AS WELL AS ELSEWHERE IN THE COUNTRY.