RWY INCURSION. AN MD80 FLT IS STOPPED HALFWAY OVER THE HOLD SHORT LINE; 50 FT FROM RWY 30L ON TXWY G AS ANOTHER ACFT ROLLS BY ON RWY AT STL; MO.

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I LANDED ON RWY 30R AT STL. THE CAPT TOOK THE CTLS AT ABOUT 60 KTS FOR THE TAXI. WE EXITED THE RWY AT INTXN G. I CONTACTED GND CTL AT THAT TIME. WE WERE INSTRUCTED TO HOLD SHORT OF RWY 30L ON INTXN G. I READ THE CLRNC BACK TO ATC. AFTER THIS; THE CAPT CALLED FOR THE AFTER LNDG CHKLIST. I WENT ABOUT MY DUTIES PERFORMING THE AFTER LNDG CHKLIST. IN DOING THESE DUTIES I WAS NOT ABLE TO LOOK OUTSIDE FOR THE SHORT TAXI TO THE HOLD LINE AT INTXN G AND RWY 30L. WHEN I FINISHED; I LOOKED UP AND NOTICED WE HAD ROLLED ABOUT HALFWAY ACROSS THE HOLD LINE AND STILL MOVING TOWARD THE ACTIVE RWY 30L. THE CAPT; AT ABOUT THE SAME TIME; MUST HAVE REALIZED WHAT HE HAD DONE BECAUSE HE STOPPED THE AIRPLANE. THE NOSE OF THE AIRPLANE WAS ABOUT 50 FT FROM THE EDGE OF THE RWY AT THAT POINT. ANOTHER ACFT HAD LANDED ON RWY 30L JUST AFTER WE STOPPED AND ROLLED PAST US ABOUT 4 SECONDS AFTER WE STOPPED. WE WERE THEN CLRED TO CROSS RWY 30L AFTER ALL OF THIS AND TAXI TO THE GATE. WE WERE ALSO INSTRUCTED TO CALL THE APPROPRIATE PHONE NUMBER TO ATC WHEN WE GOT TO THE GATE. IN RETROSPECT; I NEVER DID HEAR THE CAPT READ BACK THE HOLD SHORT CLRNC TO ME AFTER I READ IT BACK TO ATC. NEXT TIME I WILL MAKE SURE WE BOTH HEARD THE CLRNC AND VERBALIZE IT. I WILL ALSO TRY TO MONITOR OUTSIDE MOVEMENT OF THE ACFT IN ALL PHASES OF FLT MORE CLOSELY. I'LL ALSO LET THE CAPT KNOW WHEN MY EYES HAVE TO GO 'INSIDE' THE COCKPIT. OBVIOUSLY; THIS WOULD HAVE BEEN AVOIDED IF I WAS LOOKING OUTSIDE AND WE WEREN'T IN SUCH A HURRY TO CLEAN UP THE ACFT IN BTWN RWYS. SUPPLEMENTAL INFO FROM ACN 488409: AS I APCHED RWY 30L I MOMENTARILY MISTOOK RWY 30L FOR A TXWY. I FEEL THAT THE LIGHTING SYS WITH THE FLASHING YELLOW LIGHTS GOES A LONG WAY TO ATTRACT A PLT'S EYES AND HIS ATTN. THIS TXWY ONLY HAD THE PAINTED LINE.