AN A319 FLC CROSSES OVER THE HOLD SHORT LINE FOR RWY 9R WHILE ATTEMPTING TO COMPLY WITH A CHANGE IN TAXI ROUTING INSTIGATED BY GND CTL AT ORD; IL.

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WE WERE INSTRUCTED TO TAXI FROM THE GATES TO RWY 32L FULL LENGTH. INSTRUCTIONS WERE TO TAXI BY WAY OF TXWYS B; F; M; HOLD SHORT OF RWY 32L ON TXWY M. WE WERE JUST SHORT OF TXWY T HDG W ON TXWY M; WHEN THE GND CTLR ASKED IF WE COULD MAKE A L 140 DEG TURN ONTO TXWY T AND CLR AN ACFT THAT WAS IN FRONT OF US HOLDING SHORT OF RWY 32L. WE DECIDED THAT WE HAD WINGTIP CLRNC AND TOLD THE GND CTLR THAT WE COULD MAKE THE TURN. HE THEN INSTRUCTED US TO MAKE THE L TURN ONTO TXWY T; HOLD SHORT OF RWY 9R AND SWITCH TO THE TWR. I WAS CONCERNED WITH THE WINGTIP CLRNC ON MY R SIDE WHILE WE MADE THE TURN AND ALSO SWITCHING TO THE TWR FREQ. AS I LOOKED FORWARD; I REALIZED THAT WE HAD CROSSED OVER THE HOLD SHORT LINE. I ADVISED THE CAPT AND HE STOPPED THE ACFT. WE BOTH REALIZED THE PROB OCCURRED JUST AS WE MADE THE TURN ONTO TXWY T. IT WAS A 130-140 DEG TURN AND THE HOLD SHORT LINE WAS ALREADY BENEATH THE ACFT JUST BEFORE THE TURN WAS MADE AN UNUSUALLY LONG DISTANCE FROM THE ACTUAL RWY. THIS WAS NOT A NORMAL TAXI RTE FOR US TO THIS RWY; AND THE FACTORS OF ACFT CLRNC AND SWITCHING FREQS ALL AT THE SAME TIME ADDED IN OUR INABILITY TO LOCATE THE HOLD SHORT LINE. SUPPLEMENTAL INFO FROM ACN 477337: I SAW THERE WAS APPROX 200 FT OF TXWY PRIOR TO RWY 9R ON TXWY T; SO WE SAID WE COULD COMPLY. WE MADE THE TURN AND STARTED LOOKING FOR THE HOLD SHORT LINE. NOT SEEING THE HOLD SHORT LINE BUT SEEING RWY 9R WAS APPROX 75 FT IN FRONT OF US; WE STOPPED. SHORTLY THEREAFTER; TWR CTL INSTRUCTED AN ACFT LNDG RWY 9R TO GO AROUND. I THEN DETERMINED THAT THE REAL REASON FOR THE GND CTLR'S QUERY IF WE COULD FOLLOW HIS TURN TO HOLD SHORT WAS BECAUSE THE HOLD SHORT LINE WAS JUST 10-20 FT OFF OUR SIDE AND WOULD REQUIRE A TURN OF APPROX 110 DEGS AND A QUICK STOP. I DID NOT REALIZE THE HOLD SHORT LINE WAS SO FAR FROM RWY 9R AND JUST OFF OUR SIDE WHILE ON TXWY M. ALSO; THE RED RWY SIGNAGE FOR RWY 9R WAS HIDDEN FROM VIEW BY OUR NOSE DURING THE TURN. I ESTIMATE OUR ACFT STOPPED WITH THE TAIL OVER OR JUST PAST THE HOLD SHORT LINE. IF THE GND CTLR HAD MENTIONED HIS REASON FOR THE QUERY OR HAD KEPT US ON HIS FREQ UNTIL OUR TURN WAS COMPLETED; THIS INCURSION WOULD HAVE BEEN AVERTED. NONETHELESS; I SHOULD HAVE IDENTED THE HOLD SHORT POINT PRIOR TO STARTING THE TURN ONTO TXWY T.