ACR X NON ADHERENCE TO ATC CLRNC RWY INCURSION HAD LTSS FROM ACR Y EVASIVE ACTION TAKEN ABORTED TKOF.

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CLRED FOR A VISUAL APCH TO RWY 10 TO HOLD SHORT OF RWY 15R IN BWI WHILE WE WERE ON DOWNWIND. THERE WAS 4600 FT OF RWY AVAILABLE AND ONLY 3800 FT WAS REQUIRED FOR LNDG ACCORDING TO ACFT PERFORMANCE. WE ACCEPTED THE CLRNC. WE WERE CLRED FOR THE APCH AND CLRED TO LAND AND WE BRIEFED ON HOLDING SHORT OF RWY 15R. TURNING FINAL WE INTERCEPTED THE LOC AND GS AND FLEW IT INBOUND. THE APCH WAS FLOWN ON SPD. ON SHORT FINAL WE SAW AN ACFT ROLL THROUGH THE INTXN AND WE HEARD ANOTHER CLRED FOR TKOF ON RWY 15R. AT THE MIDDLE MARKER WE WENT BELOW GS TO BE ABLE TO LAND SHORTER. AFTER LNDG I WAS UNABLE TO GET THE PROPS INTO REVERSE. IT TOOK AT LEAST 3 ATTEMPTS. IT BECAME CLR THAT WE WOULD NOT BE ABLE TO HOLD SHORT OF RWY 15R. TWR ASKED IF WE COULD STOP. THE FO TOLD THEM WE WOULD BE UNABLE. ACR Y SAID HE WAS ABORTING TKOF. ALL HAPPENED ABOUT THE SAME TIME. DURING THE ABOVE CONVERSATION I FINALLY GOT IT INTO REVERSE AND WE WERE IN DEEP REVERSE AND MAX BRAKING. WE HAD SLOWED ALMOST TO A STOP JUST AS WE GOT TO THE INTXN AND TWR SAID CONTINUE ACROSS. WE WERE ALMOST STOPPED. WE CAME OUT OF REVERSE AND CONTINUED ACROSS. OUR PLAN WAS TO HOLD SHORT OF RWY 15R. THE PERFORMANCE DATA SAID WE COULD DO IT. THE PROC WAS CORRECT. THE BRIEFING WAS CORRECT. BUT WE COULDN'T HOLD SHORT. SUPPLEMENTAL INFORMATION FROM ACN 254477: ACFT HAD A NORMAL TOUCHDOWN BUT THE CAPT HAD DIFFICULTY GETTING THE PROPS INTO REVERSE THRUST. I ADVISED THE CAPT THAT THE INTXN WAS COMING UP AND THAT HE NEEDED TO STOP THE ACFT. TWR QUESTIONED IF WE WOULD BE ABLE TO MAKE THE RESTRICTION BECAUSE THE TWR HAD CLRED AN ACFT TO TKOF RWY 15R. WE WERE INVOLVED IN TRYING TO STOP THE ACFT AND COULD NOT RESPOND TO THE TWR UNTIL THE ACFT WAS INTO THE INTXN. SUFFICIENT RWY WAS AVAILABLE FOR LNDG ACCORDING TO OUR CHARTS. PROB RESULTED WHEN THE CAPT WAS UNABLE TO EFFECT REVERSE THRUST AND DECELERATE THE ACFT. SUPPLEMENTAL INFORMATION FROM ACN 254464: WE WERE CLRED FOR TKOF ON BWI RWY 15R. ACR X WAS CLRED TO LAND RWY 10 AND HOLD SHORT OF RWY 15R. WE COMMENCED A TKOF ROLL AND AT APPROX 75-80 KTS; ACR X CAME INTO VIEW AND IT WAS OBVIOUS HE WOULD BE UNABLE TO STOP SHORT OF RWY 15R. WE STARTED A REJECT AND NOTIFIED TWR. WE SLOWED AND WERE ABLE TO STOP PRIOR TO INTXN OF RWY 15R AND RWY 10 AS ACR X CONTINUED INTO THE INTXN AND THEN ALMOST STOPPED IN THE MIDDLE OF THE INTXN UNTIL TWR URGENTLY INSTRUCTED HIM TO CLR OUR RWY. THIS WAS A POTENTIAL COLLISION IF WE HAD NOT REJECTED THE TKOF IN TIME. THIS IS A VERY UNSAFE TWR PRACTICE.