WITH CLRNC TO CROSS A RWY; AN ACR PLT CROSSES THE HOLD SHORT LINE. WHILE CLEARING FOR TFC HE OBSERVES AN UNRPTED ACR ON TKOF ROLL. A SUCCESSFUL STOP IS MADE JUST BEYOND THE HOLD SHORT LINE.

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I AM IN STL; IT IS THE LAST DAY OF A 4 DAY AND THE FIRST FLT OF THE DAY. WE PUSHED ON TIME AND CONTACTED GND FOR TAXI. THE GND CTL THEN ISSUED THE FOLLOWING INSTRUCTIONS: ACR X; TAXI TO 30R; HOLD SHORT OF 30L; AT TXWY NOVEMBER. WHILE HOLDING SHORT AT 30L; THE GND CTLR ISSUED HIS SECOND INSTRUCTIONS; ACR X; EXPEDITE TO CROSS 30L; ACFT ACR Y; MD-80 ON TXWY PAPA WILL FOLLOW YOU TO 30R. I LOOKED RIGHT (INTO THE SUN); SAW THE ACFT ON FINAL; LOOKED LEFT AND SAW THE ACR Y MD-80 ON TXWY PAPA; AND PROCEEDED TO START MY RWY XING. I CLRED TO THE RIGHT FOR TFC ON 30L WHEN ANOTHER ACR Z MD-80 CROSSED IN FRONT OF OUR ACFT TAKING OFF. I KNOW I ALREADY HAD CROSSED THE HOLD SHORT LINE. I ESTIMATE THE ACFT'S WING (LEFT) WAS APPROX 35 FT FROM OUR ACFT. NO MAJOR ACTION WAS TAKEN EXCEPT APPLICATION OF THE BRAKES. WE THEN CROSSED 30L. I CALLED CLRNC DELIVERY AND REQUESTED A PHONE NUMBER TO CALL GND AT DEST. I WAS GIVEN A PHONE NUMBER BUT COULD NOT REACH STL GND SUPVR. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR INDICATED THAT THERE WAS NO RPT OF THE DEP TFC WHO WAS ON TWR FREQ. IT IS COMMON TO CLR MORE THAN ONE ACFT AT A TIME ACROSS THE ACTIVE RWY AT MULTIPLE INTXNS; AND IN TRAIL; AT THE SAME INTXN WHILE ON GND CTL FREQ AT THIS POINT.