A B757-200 FLC IS TOLD TO PULL IN BEHIND A B727-200 THAT WAS ALREADY HOLDING BTWN RWYS 25L AND 25R AT LAX. THE ACR B757-200 TAIL EXTENDED BEYOND THE HOLD LINE FOR RWY 25L WHILE A B737 TOOK OFF ON THAT RWY.

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WE LANDED ON LAX RWY 25L EXPECTING TO TURN OFF ON TXWY P; AFTER HAVING RECEIVED APPROVAL FROM TWR. AS WE WERE ROLLING DOWN RWY 25L AFTER LNDG; TWR TOLD US TO TAKE THE NEXT HIGH SPD; WHICH WAS OCCUPIED BY A B727. I TOLD THE TWR THAT THE B727 WAS ALREADY THERE; AND HE TOLD ME TO PULL UP BEIND HIM AND THAT THE TXWY WAS AUTH TO HOLD 2 B757'S. AS I PULLED ONTO TXWY M BEHIND B727; I TOLD THE TWR THAT MY TAIL WOULD NOT CLR THE HOLD SHORT LINE FOR RWY 25L. HE AGAIN TOLD ME THE TXWY WAS AUTH TO HOLD 2 B757'S. I PULLED UP BEHIND THE B727 AS CLOSE AS I DARED; NO MORE THAN 30 FT BEHIND HIM AS THE TWR CLRED A B737 FOR TKOF ON RWY 25L; AND I KNOW MY AIRPLANE WAS STILL OVER THE HOLD SHORT LINE. I WAS EXTREMELY UNCOMFORTABLE WITH THE SIT. I KNOW LAX IS OVERWORKED; BUT TRYING TO STACK TWO LONG PLANES ON A FAIRLY SHORT TXWY; BTWN RWYS; IS PUSHING THINGS WAY TOO FAR. THEY NEED TO CLR THE HIGH SPDS BTWN RWYS BEFORE CLRING MORE PLANES ONTO THEM. I ALSO THINK AIRPLANES SHOULD BE CLR OF HOLD SHORT LINES BEFORE OTHER PLANES TAKE OFF ON RWYS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THIS B757-200 CAPT SAID THAT HE WAS TOLD TO TAKE THE NEXT HIGH SPD TXWY AS HE WAS JUST COMING UP ON TXWY L AT A HIGH INDICATED AIRSPD. HE WAS TOO FAST TO MAKE THE TURN. THE CTLR THEN TOLD HIM TO TAKE TXWY M. AN ACR B727-200 WAS ALREADY ON TXWY M AND THE RPTR SAID THAT HE POINTED THIS OUT. THE CTLR SAID THAT HE WOULD FIT AS THE TXWY WOULD HOLD 2 B757'S. THE CAPT SAID THAT HE COULD SEE THAT THE AVAILABLE SPACE WOULD REQUIRE HIS TAIL SECTION TO PROTRUDE BEYOND THE HOLD LINE. THE RPTR SAID THAT HE PULLED TO WITHIN 30 FT OF THE B727-200; BUT NO CLOSER TO AVOID INGESTING EXHAUST FUMES. THE CAPT SAID THAT HE WAS SO UNCOMFORTABLE WITH THIS SIT THAT HE WILL NOT DO SOMETHING LIKE IT IN THE FUTURE.