AN ACR FLC INADVERTENTLY TAXIED ONTO A RWY. THE CAPT CITED DISTR; FATIGUE; INEXPERIENCE IN CREW MEMBER POS; AND A LACK OF FAMILIARITY WITH THE ARPT.

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AFTER ENG START; OUR TAXI INSTRUCTIONS WERE 'RWY 9L VIA TXWY H; B; A7; T.' AFTER RECEIVING RELEASE FROM PUSHBACK CREW; A L TURNOUT FROM OUR COMPANY GATE AT ORD WAS MADE ONTO WHAT WAS THOUGHT TO BE TXWY H. AT THE LAST MIN; THE CREW REALIZED IT WAS RWY 9L. THE BRAKES WERE APPLIED IMMEDIATELY; BUT NOT IN TIME TO KEEP THE NOSEWHEEL FROM ENTERING THE RWY. AFTER GND WAS INFORMED; WE WERE TOLD TO TURN L ON RWY 9L; TAXI W TO NEXT EXIT; AND TURN L TO REJOIN TXWY B. THERE WASN'T ANY TFC LNDG OR DEPARTING RWY 9L AT THE TIME OF THE INCIDENT. CONTRIBUTING FACTORS: 1) IT WAS XW30 PM ON MY BODY CLOCK; THE 4TH DAY OF 5 DAYS OF FLYING; AND I WAS VERY TIRED. 2) FIRST LEG OF FLYING WITH A NEW CREW. 3) CAPT AND SO HAD 1 MONTH OF EXPERIENCE IN THEIR RESPECTIVE SEATS. 4) FO WAS REVIEWING DEP CHART INSTEAD OF WATCHING OUTSIDE. 5) SO WAS OUT OF COCKPIT AT TIME OF INCIDENT; ASSISTING FLT ATTENDANT WITH BAGGAGE PROB. REMEDIES: 1) EVERYONE'S ATTN OUTSIDE UNTIL ESTABLISHED ON TXWY. 2) ALL BAGGAGE; PAX; CABIN PROBS; ETC; RESOLVED BEFORE LEAVING GATE. 3) ON FIRST LEG WITH NEW CREW; GO SLOWER; ASK LOTS OF QUESTIONS; VERIFY EVERYTHING; DON'T ASSUME ANYTHING. 4) FOR FATIGUE PROBS; TAKE NAPS WHEN POSSIBLE TO HELP STAY MORE ALERT DURING LONG STRETCHES OF FLYING.