B737 FLC STOPPED PAST THE ACTIVE RWY HOLD SHORT LINE DURING TAXI RESULTING IN THE TWR SENDING ANOTHER ACFT ON FINAL AROUND EVEN THOUGH THE ACFT WAS NOT PROTRUDING ONTO THE RWY.

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AFTER ARRIVING STL ON RWY 30R; TAXIED CLR OF RWY ONTO TXWY N; CONTACTED GND. TOLD TO TURN R ON TXWY P AND L ON TXWY H AND HOLD SHORT OF RWY 30L. WHILE ON TXWY H; PASSED HOLD SHORT PRIOR TO RWY BEFORE STOPPING. TWR SENT ACFT ON FINAL RWY 30L AROUND. NOTHING SAID TO US BY GND AT THIS TIME. TOLD TO CROSS RWY 30L AND TAXI TO GATE AND CALL TWR. THE TXWY WAS VERY DARK AND YOU COULD NOT SEE THE RWY LIGHTS. I KNEW I WAS SUPPOSED TO STOP AND WAS CONCENTRATING ON THAT. I WAS LOOKING SO HARD FOR THE RWY THAT I DID NOT SEE THE HOLD SHORT LINE TILL I PASSED IT. THERE ARE INTERSECTING TXWYS AT THIS AREA AND NO YELLOW HOLD SHORT FLASHING LIGHTS. THE HOLD SHORT SEEMS TO BE BACK FARTHER FROM THE RWY THAN USUAL. MY TAXI LIGHT WAS WEAK AND IT WAS A VERY DARK NIGHT. FLEW TO IND AND BACK LATER THAT NIGHT. RETRACED OUR STEPS AFTER EXITING RWY 30R AND WAS AGAIN ON TXWY H. I COULD SEE HOW I MISSED IT IN THAT LOW LIGHT. ALTHOUGH I DID PASS THE HOLD SHORT LINE; I DID NOT ENTER ONTO THE RWY IN THIS INCIDENT. IT NEEDS YELLOW FLASHERS AT THE HOLD SHORT. SUPPLEMENTAL INFO FROM ACN 531228: CROSSED HOLD LINE OF ACTIVE RWY. AFTER LNDG ON RWY 30R IN STL; WE EXITED AT TXWY N AND CALLED GND. GND GAVE US A CLRNC OF R ON TXWY P; L ON TXWY H; HOLD SHORT OF RWY 30L. I READ BACK THE COMPLETE CLRNC. AS WE TURNED L ON TXWY H; WE ROLLED PAST THE HOLD LINE FOR RWY 30L; BUT STOPPED SHORT OF THE RWY. ACFT ON SHORT FINAL FOR RWY 30L WENT AROUND.