A NIGHT OP RWY INCURSION AS A CPR JET TAXIES OVER AND STOPS ON THE HOLD SHORT LINE FOR RWY 19 AT TEB; NJ.

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FIRST FLT OF THE DAY IFR FROM TEB TO PBI. PAX SHOWED UP EARLY. I WAS GETTING THE ATIS; CLRNC AND RELOADING THE FMS BECAUSE OF A FULL RTE RERTE. CAPT BRIEFED THE PAX AND WAS IN A LITTLE BIT OF A HURRY TO GET MOVING. WE WERE PARKED AT FBO AND GND CTL CLRED US TO TAXI TO RWY 24 HOLD SHORT OF RWY 19. WE REPEATED 'TAXI RWY 24 HOLD SHORT OF RWY 19.' THE CAPT STARTED TO TAXI AND ONCE WE WERE CLR OF OTHER PARKED ACFT ON THE RAMP I WENT HEAD-DOWN AND STARTED THE TAXI CHKLIST. THE CHKLIST IS ON THE MFD SO MY EYES WERE FOCUSES DOWN AND IN THE LOWER MIDDLE OF THE CTR PANEL. AS WE STARTED TO LEAVE THE RAMP; I REPEATED 'RWY 24 HOLD SHORT RWY 19.' THE CAPT REPEATED; ALOUD; MY INSTRUCTIONS. I CONTINUED WITH THE CHKLIST AND OUT OF THE CORNER OF MY EYE I SAW THE HOLD SHORT LINE COMING UP RATHER RAPIDLY. I AGAIN SAID 'HOLD SHORT OF RWY 19' AS OUR NOSEWHEEL ROLLED OVER THE HOLD SHORT LINE. THE CAPT SAID 'THAT WAS OUR HOLD SHORT LINE WASN'T IT?' I SAID YES. WE CAME TO A STOP WITH OUR MAIN GEAR ON THE HOLD SHORT LINE. 2 ACFT LANDED ON RWY 19 AS WE WAITED TO CROSS. I TRULY BELIEVE THAT OUR MISTAKE WENT UNNOTICED TO GND CTL AND THE 2 ACFT THAT LANDED. THE ACFT IN LINE BEHIND US; HOWEVER; WAS PROBABLY THE ONLY WITNESS TO WHAT WE HAD DONE. CONTRIBUTING FACTORS: BEING IN A HURRY. THE QUICKEST WAY TO A MISTAKE IS TO BE IN A HURRY. CONSTRUCTION ADJACENT TO THE RAMP AND TXWY COMING OUT OF FBO'S RAMP MAY HAVE BEEN A DISTR. ALSO; THE HOLD SHORT LINE FOR RWY 19 APPEARS TO HAVE BEEN RELOCATED FARTHER FROM THE RWY AND CLOSER TO THE RAMP. IT COMES UP QUICK. STILL NONE OF THIS IS AN EXCUSE FOR A RWY INCURSION. LAST; THE FO HAD HIS HEAD DOWN DOING A CHKLIST DURING A TAXI AND HOLD SHORT CLRNC. DOING A CHKLIST ON A LONG PARALLEL TXWY IS A RELATIVELY SAFE PRACTICE; BUT DOING A CHKLIST WHILE CONDUCTING A SHORT TAXI WITH A HOLD SHORT CLRNC IS A BAD IDEA. IT KEEPS THE FO'S HEAD DOWN AND CAN DISTRACT THE CAPT FROM WHAT HE IS SUPPOSED TO BE DOING -- PAYING ATTN OUTSIDE. IN THE FUTURE; I WILL ATTEMPT TO COMPLETE TAXI CHKLISTS AT A MORE APPROPRIATE TIME AND EVEN STOP THE ACFT FOR A SHORT PERIOD OF TIME IF NECESSARY.