DURING TAXI FOR DEP OFF RWY 17 AT MHT; A CL65 CREW INADVERTENTLY CROSS THE HOLDING POSITION MARKINGS.

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WE WERE HOLDING SHORT OF RWY 24 FOR ARRIVING TFC. ONCE THE TFC LANDED; WE WERE CLEARED TO CROSS RWY 24 AND PROCEED TO HOLD SHORT OF OUR DEP RWY 17. ONCE WE CROSSED RWY 24; THE CAPT ASKED FOR THE 'BEFORE TKOF' CHECKLIST. I WAS 'HEADS DOWN' READING THE CHECKLIST WHEN GND CTL TOLD US TO STOP. HE INFORMED US THAT WE HAD CROSSED THE HOLD SHORT LINE FOR RWY 17. THE HOLD SHORT LINE EXISTS ABOUT 150 YDS SHORT OF THE RWY. THE CAPT AND I HAD NOTICED ON OUR COMMERCIAL PLATES THAT THERE EXISTED A HOLD PAD ADJACENT TO RWY 17. THE HOLD PAD WAS ACTUALLY PART OF THE RWY ENVIRONMENT. IN ADDITION; IT WAS DARK AND RAINING AND THE TAXI LIGHTS ON OUR ACFT; ALTHOUGH WORKING PERFECTLY; DID NOT ILLUMINATE OUR PATH BRIGHT ENOUGH FOR THE CONDITIONS. ALSO; AFTER THE GND CTLR TOLD US WE HAD CROSSED THE HOLD SHORT MARKINGS; HE STATED THAT THEY WERE POORLY MARKED. THE FACTOR OF POOR TAXI MARKINGS; OUR ASSUMPTION WAS THAT THE HOLD SHORT LINE WOULD BE CLOSER TO THE RWY; THE ENVIRONMENTAL FACTORS OF RAIN AND DARKNESS; THE DISTRACTION OF READING THE CHECKLIST IN AN AREA I THOUGHT WAS SAFE; AND POORLY DESIGNED TAXI LIGHTS; ARE ALL FACTORS THAT LED TO THE RWY INCURSION. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED AFTER XING RWY 24; THE CAPT ASKED FOR THE BEFORE TKOF CHECKLIST. HE SAID HE WAS HEAD DOWN WHILE COMPLETING SOME OF THE REMAINING ITEMS ON THE CHECKLIST. HE STATED THE CHART HE WAS USING ON THE DAY OF THE INCIDENT DID NOT SHOW ANY ILS OR HOLDING POSITION MARKINGS. HE SAID THE CURRENT CHART NOW SHOWS HOLDING POSITION MARKING FOR ILS BUT; DOES NOT SHOW RWY HOLDING POSITION MARKINGS.