A DC9-50 REJECTED TKOF AT 90 KTS DECLARED AN EMER AND EVACED DUE TO A CONTAINED FAILURE OF #2 ENG CAUSED BY A FAILED TURBINE SECTION BEARING.

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IT WAS THE FO'S LEG. ON TKOF ROLL AT ABOUT 90 KTS; WE FELT AND HEARD A LOUD VIBRATION AND EXECUTED ABORT PROCS. BECAUSE THERE WERE NO OTHER INDICATIONS; WE BELIEVED WE'D BLOWN A TIRE. FO XYZ ASKED THE TWR IF THEY SAW ANYTHING AND THEY RPTED 'NO.' WE HAD PLANNED TO EXIT THE RWY. SHORTLY THEREAFTER TWR CALLED BACK AND SAID THEY SAW FLAMES OUT THE R ENG. WE STOPPED THE AIRPLANE BY TXWY E; DID NOT EXIT THE RWY; AND CONTINUED WITH THE ABORT/EVAC AND ENG FIRE PROCS. WE NEVER DID SEE ANY FIRE INDICATIONS; ONLY RPTS FROM THE TWR. THE FLT ATTENDANTS RPTED THAT THE LANYARD BROKE ON THE R SIDE FORWARD EXIT SLIDE. BY THEN THE TWR RPTED THAT THE FIRE WAS OUT; AND THE 139 PAX EVACED VIA THE L SIDE FORWARD STAIRS. NO INJURIES OCCURRED. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE ACFT WAS A DC9-50 PWRED WITH JT8D-15 ENGS AND THE FAILURE WAS CONTAINED. THE RPTR SAID THE ENG WAS RELATIVELY NEW AND HAD TO BE CHANGED. THE RPTR SAID MAINT SUSPECTED A TURBINE SECTION MAIN BEARING FAILURE BUT WON'T BE CERTAIN UNTIL THE ENG IS TORN DOWN. SUPPLEMENTAL INFO FROM ACN 393825:I TURNED ON MY EMER EXIT LIGHT SYS; ASSESS AREA OF RESPONSIBILITY AND OVERHEARD THAT THE FIRE WAS OUT. ALSO; FROM THE SECOND FLT ATTENDANT THAT EVERYTHING WAS OK. SO TO MINIMIZE PAX INJURY; I ELECTED TO USE THE FORWARD STAIRS. DURING EVAC I WAS ON THE PA WITH MY COMMANDS TO LEAVE ALL BAGS AND EVAC THROUGH FORWARD DOOR.