A B757-200 CREW RPTS MISSING A NEW 'TXWY B HOLD SHORT LINE' WHILE ON BOS TXWY B AND INCURRING RWY 4L.

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CLRED TO TAXI TO RWY 9R VIA 'TXWY B.' THIS IS THE 'NEW' TXWY B THAT WAS MOVED E ON AUG/FRI/05. A HOLD SHORT OF RWY 4 WAS ALSO GIVEN; IT DID NOT REGISTER WHICH 4. WE CHKED THE NEW 10-8 CHART DEPICTING THE NEW TXWY B AND SAW A HOLD SHORT LINE DEPICTED SHORT OF RWY 4R. (THE OLD; COMPLEX 'TXWY B HOLD POINT' IS GONE.) AS IT DID NOT APPEAR THAT WE WOULD BE TAXIING ACROSS RWY 4R; I WASN'T SURE WHAT THIS CLRNC MEANT; BUT I WAS BUSY FINDING THE NEW TXWY B AND ASSUMED THAT IT WOULD BE EVIDENT WHEN WE GOT TO RWY 4R. AS WE ROUNDED THE CORNER OF THE NEW TXWY B; GND CTL TOLD US TO MONITOR THE TWR AND HOLD SHORT OF RWY 4L. I AGAIN ASSUMED THAT HE MEANT RWY 4R; AS WE WOULD NOT BE XING RWY 4L AT ALL (THE APCH END OF RWY 4L WAS PROBABLY 2000 FT TO THE NE; AND IS BARELY DEPICTED ON THE 10-8 CHART). WHEN WE SWITCHED TO TWR; HE TOLD US TO HOLD SHORT OF RWY 4L AND THEN SAID; 'OH; YOU'VE ALREADY PASSED THE HOLD SHORT LINE.' I LOOKED AND SURE ENOUGH; WE HAD JUST PASSED A HOLD SHORT LINE. THIS LINE HAD NOT REGISTERED WITH ME AS WE WERE NOWHERE NEAR A RWY. WE STOPPED WITH THE FRONT OF THE ENGS JUST PAST THE LINE. THE TWR THEN PROCEEDED TO GIVE AN ACR FLT ON FINAL GAR INSTRUCTIONS; EVEN THOUGH THE WX WAS PERFECT AND WE WERE NOWHERE NEAR THE RWY OR ACFT Y'S FLT PATH. I ASSUME THAT THIS IS A RWY INCURSION; EVEN THOUGH WE WERE AT LEAST 1/4 MI FROM THE RWY. OR PERHAPS A FLT PATH INCURSION. THERE USED TO BE A COMPLEX OF 'TXWY B HOLD POINTS' PRESUMABLY TO PREVENT FLT PATH INCURSIONS ON RWY 4L; BUT THE NEW 10-8 CHART ONLY SHOWS YOU TAXIING FAR AWAY FROM THE END OF RWY 4L AND SHOWS NO RWY 4L HOLD LINE WHERE THE LINE ACTUALLY IS. I DON'T RECALL SEEING ANY SIGNS ASSOCIATED WITH THIS HOLD LINE (THOUGH I DIDN'T SEE IT UNTIL AFTER WE HAD CROSSED IT); BUT WHEN WE RETURNED FROM MDSD AT ABOUT XA45; THERE WERE 1/2 DOZEN WORK TRUCKS AROUND EACH END OF THIS LINE; SO PERHAPS THE SIGNS HAVE BEEN INSTALLED. OR MAYBE IT'S NOW THE 'NEW' TXWY B HOLD POINT. SUPPLEMENTAL INFO FROM ACN 669798: THERE IS NO HOLD SHORT LINE ON THE 10-8 PAGE FOR RWY 4L; AND THE INSTRUCTIONS FROM TWR WERE CONFUSING BECAUSE FROM THE NEW TXWY B; YOU NEVER APCH RWY 4L. ESSENTIALLY; YOU ARE HOLDING SHORT OF AN EXTENDED CTRLINE FOR A RWY YOU CAN BARELY SEE.