RWY INCURSION; RWY 26; BY A B737 CREW WHEN PIC MISSES A PART OF THE CLRNC FOR A HOLD SHORT AT ABQ; NM.

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NORMAL PUSHBACK FROM GATE; PERFORMANCE DATA COMPLETED FOR RWY 26. WE CALLED FOR TAXI WITH ATIS AND WERE GIVEN THE OPTION FOR RWY 26 OR RWY 21. AS RWY 21 WAS A MUCH SHORTER TAXI AND RWY ALIGNED CLOSER TO THE DESIRED DEP HEADING; WE REQUESTED RWY 21. WE WERE GIVEN TAXI INSTRUCTIONS; 'GIVE WAY TO REGIONAL JET ON YOUR R AND TAXI TO RWY 21 VIA TXWY C; TXWY E; HOLD SHORT RWY 26.' THIS CLRNC WAS READ BACK VERBATIM BY THE FO. UNFORTUNATELY; DURING BOTH XMISSIONS; I FAILED TO HEAR THE HOLD SHORT PORTION OF THE CLRNC. IN MY MIND; WE WERE CLRED TO CROSS ALL RWYS TO RWY 21. AFTER LOCATING THE RJ; I MADE A R TURN OUT TO MANEUVER BEHIND THE SLOW MOVING ACFT AND TAXIED PER MY PERCEIVED INSTRUCTIONS: TXWY C; TXWY E; RWY 21. MEANWHILE; THE FO WAS HEADS DOWN COMPUTING PERFORMANCE DATA FOR RWY 21. AS A NOTE; I REALIZE THE FOM PROHIBITS COMPUTING OPC DATA WHILE APCHING/XING A RWY; BUT DUE TO THE SLOW MOVING RJ AND THE MANEUVERING REQUIRED TO POS BEHIND SUCH ACFT; I FELT WE HAD SUFFICIENT TIME TO COMPLETE THE PERFORMANCE DATA AND COMPLY WITH THE FOM. THE RJ CONTINUED PAST INTXN C AND I PROCEEDED TO MAKE A R TURN ON TXWY C AND CROSS RWY 26 WITHOUT CLRNC. PRIOR TO XING RWY 26; I LOOKED L AND NOTED COMPANY TFC APPROX 3000-4000 FT AWAY AT TAXI SPD AND COMMENCING A R TURN OFF RWY 26. I THUS CONTINUED TO BE CONFIDENT IN MY PERCEIVED CLRNC TO CROSS THE RWY. APPROX 1/2 WAY ACROSS RWY 25; THE FO LOOKED UP AND TOLD ME WE WERE INSTRUCTED TO HOLD SHORT RWY 26. AT THIS POINT; I INCREASED PWR TO EXPEDITE XING AND ASKED THE FO TO CONFIRM OUR TAXI CLRNC. WE WERE INDEED INSTRUCTED TO HOLD SHORT. FORTUNATELY; NO CONFLICT WITH ANY ACFT OCCURRED. MY THOUGHTS ON HOW THIS SIT OCCURRED: MOST SIGNIFICANT WAS THE FO BEING HEADS DOWN AND COMPUTING PERFORMANCE FOR THE RWY CHANGE. I AM CONFIDENT THIS EVENT WOULD NOT HAVE OCCURRED IF WE WERE BOTH MONITORING THE TAXI RTE. THE OTHER SIGNIFICANT CAUSE WAS MY MISUNDERSTANDING OF THE CLRNC. I BELIEVE THE FACT THAT I WAS BUSY TRYING TO LOCATE AND AVOID HITTING THE RJ; TOGETHER WITH TRYING TO DETERMINE HOW TO NAV MY UNEXPECTED TAXI RTE WHILE THE CLRNC WAS BEING GIVEN CAUSED ME TO HEAR WHAT I WANTED TO HEAR -- TXWY C; TXWY E; TAXI TO RWY 21. ANOTHER ERROR I COMMITTED WAS NOT REPEATING THE TAXI CLRNC TO THE FO; WHICH IS MY USUAL HABIT. TASK OVERLOAD (RJ; NEW RTE) PRECIPITATED THIS LACK OF ACTION ON MY PART. LESSONS LEARNED: I WILL ALWAYS READ BACK TAXI CLRNC AS I UNDERSTAND IT TO THE FO. I WILL; IF POSSIBLE; DELAY MY TAXI UNTIL NEW PERFORMANCE IS CALCULATED GIVEN A RWY CHANGE. IF I HAD FOLLOWED THE ABOVE; I WOULD NOT BE WRITING THIS RPT. SUPPLEMENTAL INFO FROM ACN 603228: ABQ GND CTL ISSUED THE FOLLOWING CLRNC: 'TAXI TO RWY 21 VIA TXWY C AND TXWY E; HOLD SHORT RWY 26; GIVE WAY TO THE REGIONAL JET OFF YOUR R.' I RESPONDED WITH A FULL CLRNC READBACK. I ASKED THE CAPT (WHO WAS LOOKING AT HIS ARPT DIAGRAM) IF HE HAD THE RJ IN SIGHT AND HE SAID; 'I GOT HIM.' AS WE BEGAN THE SLOW TAXI; I STATED TO CAPT; 'I AM HEADS DOWN' AND HE ACKNOWLEDGED. AFTER STOWING THE OPC; I LOOKED UP AND WAS STARTLED TO SEE WE WERE TAXIING OUT ONTO ACTIVE RWY 26. I CALLED OUT; 'STOP; STOP; WE WERE TOLD TO HOLD SHORT OF RWY 26!' CAPT APPLIED THE BRAKES; THEN THE THROTTLES WHEN HE REALIZED WE WOULD BE STOPPED IN THE MIDDLE OF THE RWY; AS THERE WAS AN ACFT SEVERAL THOUSAND FT DOWN ON RWY 26. I ASKED HIM IF HE SAW THE ACFT ON THE RWY AND CAPT STATED; 'YES; BUT THE ACFT WAS AT TAXI SPD AND IT IS NOT UNUSUAL FOR GND CTL TO ISSUE XING CLRNCS UNDER THOSE CIRCUMSTANCES.' WE WORKED VERY WELL TOGETHER AS A TEAM; ADHERING TO COMPANY PROCS DURING OUR TRIP. IT IS VERY DISAPPOINTING TO ME THAT WHEN IT SEEMED WE WERE DOING EVERYTHING RIGHT; SOMETHING SO IMPORTANT WENT WRONG. TO PREVENT AN OCCURRENCE OF THIS NATURE FROM HAPPENING; AGAIN; I WILL INSIST ON COMPLETING OPC/FMC CALCULATIONS ONLY WHEN THE ACFT IS STOPPED. IT WAS A JUDGEMENT CALL; ONE MADE INCORRECTLY. THE DECISION TO MOVE THE ACFT WHILE ONE PERSON WAS HEADS DOWN; REMOVED THE VERY IMPORTANT SECOND SET OF EYES THAT EXISTSAS A SAFETY NET.