A B727-200 FLC CROSSES OVER THE HOLD SHORT LINE WHEN OVER-BURDENED WITH DISTRACTIONS AT MDW; IL.

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MIDWAY (MDW) GND CTLR TOLD US TO 'CROSS RWY 22L WITH NO DELAY; HOLD SHORT RWY 22R.' THE CAPT STOPPED THE ACFT WITH THE NOSE GEAR ACROSS THE RWY 22R HOLD SHORT LINE. THERE WAS AN ACFT ON RWY 4L WAITING FOR TKOF CLRNC. WE ASKED THE CTLR IF WE ARE CLRED ACROSS RWY 22R. HE SAID HOLD SHORT. THE CTLR THEN SAW OUR POS ON THE TXWY AND CLRED US ACROSS RWY 22R; NO DELAY. SUPPLEMENTAL INFO FROM ACN 486155: WHILE MAKING THE 90 DEG TURN FOR RWY 4R HOLD SHORT LINE; GND CTL INSTRUCTED US TO; '...KEEP IT COMING AROUND; CROSS RWY 4R; HOLD SHORT OF RWY 4L; TFC ON A 2 (OR 3?) MI FINAL FOR RWY 4R.' I PUSHED UP THROTTLES #1 AND #2; #3 WAS NOT YET STARTED FOR FUEL CONSERVATION REASONS. I WORRIED ABOUT THE JET BLAST. EARLIER I ASKED THE FO TO ASK GND HOW MUCH OF A DELAY TO EXPECT DURING HIS NEXT XMISSION. WE STILL NEEDED TO START #3. HE FORGOT. I REMIND HIM. NOW HE ASKS DURING THE READBACK. I LOOK AT THE APCH END OF RWY 13C AND SEE A B737 AND GUESS WE ARE FOLLOWING HIM. WE ARE RAPIDLY APCHING THE RWY 4L HOLD SHORT LINE AND THE FE SAYS; 'ARE WE CLRED TO CROSS?' I IMMEDIATELY STOP. CONTRIBUTING FACTORS: PREFLT PREPARATIONS WERE RUSHED. I GOT THE PAPERWORK FROM OPS ABOUT 45 MINS PRIOR TO PUSHBACK TIME. GOT TO THE ACFT AND DID PREFLT. WE WERE NEAR OUR RWY PERFORMANCE LIMIT AND NEEDED TO SELECT THE APPROPRIATE RWY. GATE AGENTS HAD QUESTIONS ABOUT HOW MANY PEOPLE TO BOARD (OVERBOOKED; COMPANY LIMIT 160; WE CRUNCH THE NUMBERS AND CAN TAKE 173 PAX IF WE USE RWY 13C). AFTER FUELING; THERE'S A DISCREPANCY BTWN THE FUEL TRUCK READING AND THE ACTUAL FUEL ONBOARD. PER ACFT OPERATING MANUAL; WE CONTACT APPROPRIATE PEOPLE. THIS TAKES TIME TO SOLVE. WE PUSH OFF THE GATE ONLY 5 MINS LATE AND I'M FRAZZLED. WE NEEDED TO CONSERVE FUEL DUE TO FLORIDA WX. RWY 4L HAD BEEN NOTAMED CLOSED FOR SEVERAL DAYS AND WAS CLOSED WHEN WE TAXIED IN 1 HR 15 MINS PRIOR. IT HAD JUST OPENED. I HAVE BEEN TRYING TO INCORPORATE VERBALIZING ATC READBACKS TO THE CREW WITHIN THE LAST 2 MONTHS; SO THE CREW CAN CORRECT ME IF I MISUNDERSTAND. THINGS WERE TOO HECTIC DURING THE 90 DEG TURN AND RWY XING AND THIS TIME I DIDN'T DO IT. I'LL DO IT IN THE FUTURE. HAVE CTLRS TELL PLTS ONLY 1 OR 2 THINGS AT A TIME (IE; 'CROSS RWY 4R. HOLD SHORT RWY 4L'). WHEN I'M ON A RWY TAXIING; IT'S LIKE I HAVE THE RWY TO MYSELF. WE DON'T DO LAHSO SO WHEN I'M ON A RWY; I HURRY TO GET OFF AND CLR. I DON'T THINK TAXIING AROUND ON RWYS IS A GOOD IDEA.