ACR LANDS OVER THE TOP OF ANOTHER ACR OCCUPYING THE SAME RWY AS PER TWR CLRNC.

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AS WE APCHED RWY 30L AT SJC; WE NOTICED AN ACFT ON FINAL APCH. WE CONTACTED THE TWR; INFORMED THEM WE WERE READY FOR TKOF. TWR THEN CLRED US IN POS; ON THE HOLD; THE TIME WAS XA19 LCL. THE TWR CTLR BECAME VERY BUSY WITH A NUMBER OF LIGHT ACFT. OUR CONVERSATION WAS CONCERNED WITH THE ACFT WE HAD SEEN ON FINAL; WE THOUGHT; PERHAPS IT WAS LNDG ON RWY 30R. AS WE CONTINUED TO HOLD; I ADDED MORE LIGHTS ON THE STROBES; POS AND BEACON LIGHTS WERE ON AS WE WENT IN POS; FIRST PUTTING ON THE R AND THEN L LNDG LIGHT. THE TWR FREQ WAS EXTREMELY CONGESTED; WE WANTED TO INFORM THE TWR THAT WE WERE STILL IN POS; BUT WE COULDN'T BREAK IN. AT APPROX XA20 OR XA22 A DC9-80 ASKED THE TWR IF THEY WERE STILL CLRED TO LAND. THE TWR CONFIRMED CLRNC TO LAND AS THEY PASSED OVERHEAD AND LANDED ON RWY 30L. THAT WAS OUR FIRST REAL CONFIRMATION THAT AN ACFT WAS IN FACT ON FINAL FOR RWY 30L. IMMEDIATELY AFTER THE DC9-80 LANDED WE WERE ABLE TO CALL THE TWR AND ASKED IF THEY KNEW THAT WE WERE IN POS ON RWY 30L. THE TWR PAUSED; BUT THEN AFFIRMED OUR PRESENCE. AT XA23 WE WERE CLRED FOR TKOF AND THE REMAINDER OF THE FLT PROCEEDED UNEVENTFULLY. AFTER SPEAKING WITH THE TWR MGR AT SJC; IT WAS OBVIOUS THAT THE TWR CTLR WAS IN ERROR -- HE WAS OVERLOADED WITH LIGHT ACFT. HOWEVER; MY MAIN CONCERN IS WITH THE OTHER CREW; WHO CONTINUED THEIR APCH TO LNDG WITH AN ACFT ON THE RWY. IN MY OPINION THIS CREW WAS NEGLIGENT; THEY HAD TO HAVE SEEN US. AT THE VERY LEAST; THEIR SITUATIONAL AWARENESS WAS NON-EXISTENT.