FLC OF AN MD80 TOOK EVASIVE ACTION TO INCREASE THEIR DEP CLB IN RESPONSE TO A TCASII RA AND TO MAINTAIN VISUAL SEPARATION WITH ANOTHER ACFT CLBING OUT BELOW AND BEHIND THEM.

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OUR FLT WAS OFF SAN AT XX21Z FROM RWY 27. SOCAL DEP CTL ON 119.6 CLRED US TO TURN R TO 90 DEGS; GO DIRECT IPL WHEN ABLE AND CLB TO FL230. AT ABOUT HALF WAY THROUGH THE TURN; SOCAL ADVISED US OF AN ACR Y; A B757; DEPARTING BEHIND US WOULD BE TURNING R FOR THERMAL VOR AND KEEPING US IN SIGHT VISUALLY AS IT WILL PASS BELOW AND BEHIND US ALSO IN A R TURN. I DID NOT SEE ACR Y UNTIL WE WERE HEADING THROUGH ABOUT 010 DEGS. IT APPEARED ON OUR TCASII AT 4 O'CLOCK AND ABOUT 5 MI AT FIRST. THE FO WAS FLYING AND SAW HIM TURNING INSIDE OUR TURN AND CLBING. ACR Y TOLD SOCAL DEP THAT HE SAW US IN HIS ACCEPTANCE OF THE VISUAL CLB CLRNC; BUT MUST NOT HAVE REALIZED OUR INTENDED TRACK; AS HE CONTINUED TO TURN AND CLB INTO US IN WHAT LOOKED LIKE A REJOINING FORMATION MANEUVER. AT 9500 FT MSL AND HDG 070 DEGS; WE GOT A TCASII CALL TO MONITOR VERT SPD FOLLOWED SHORTLY BY A RA COMMAND TO CLB. THE ACR Y PLT ASKED SOCAL WHAT WE WERE DOING AS HE AS ALSO GETTING A TCASII ALERT OF SOME KIND. WE ROLLED WINGS LEVEL TO INCREASE OUR CLB RATE TO STAY ABOVE THE RED LIGHTS IN THE VSI AS WE WEIGHED 152000 LBS AT TKOF AND WERE CLBING ABOUT 1500 FPM IN THE TURN AT 250 KTS. THE VSI REQUIRED 2500 FPM TO SATISFY THE RA AND WE WERE CLR OF TFC AT ABOUT 11500 FT MSL AND 210 KIAS. THE TCASII DISPLAY SHOWED THE ACR Y B757 PASSING IMMEDIATELY AFT OF OUR ACFT ON THE 10 MI DISPLAY AND AT 300 FT BELOW US PASSING OFF TO OUR 7 O'CLOCK THEN. I ADVISED SOCAL DEP WE WOULD FILE A RPT AND TO PULL THE TAPES.