FLC OF AN MDT TURBOPROP EVACED PAX AND CREW ON TXWY DURING TAXI FOR TKOF DUE TO ENG FIRE. EMER DECLARED.

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WHILE TAXIING FOR DEP; FLT RECEIVED A L TAIL PIPE HOT ANNUNCIATOR. DURING THE EMER SHUTDOWN OF THE L ENG; THE FLT ATTENDANT WAS CALLED AND SHE WAS ABLE TO CONFIRM THAT THE L ENG WAS INVOLVED IN A FIRE. ACR Y DC9 BEHIND US CONFIRMED THAT THE ACFT WAS SIGNIFICANTLY INVOLVED IN FIRE. THE CAPT SELECTED FUEL OFF ON BOTH CONDITION LEVERS WHILE I ORDERED THE FLT ATTENDANT TO BEGIN AN EMER EVAC OUT THE R HAND SIDE OF THE ACFT. I ALSO INFORMED PHL TWR THAT WE WERE EXECUTING AN EMER EVAC AND IMMEDIATE ASSISTANCE WAS REQUIRED. I ACCOMPLISHED MY EMER EVAC PROCS QUICKLY AND EFFICIENTLY AND ASSISTED IN THE EVAC OF THE CABIN. ONE POINT OF DIFFICULTY I HAD; THOUGH; WAS DEPLOYING THE L ENG FIRE BOTTLE. THE SAFETY WIRE WAS TOO HVY AND VERY TIGHTLY BOUND FOR ME TO BE ABLE TO MOVE THE SWITCH. I DID HOWEVER; QUICKLY TRANSFER THE R FIRE BOTTLE TO THE L ENG NACELLE AFTER ABANDONING MY EFFORTS ON THE STUCK SWITCH ON THE L FIRE BOTTLE. 28 PAX AND 1 BABY PLUS 3 CREWMEMBERS WERE EVACED WITH ZERO INJURIES. THE ACFT EXPERIENCED SIGNIFICANT DAMAGE. AS OF NOW; THE CAUSE IS UNKNOWN. THE CREW IS BEING PRAISED FOR A HIGH DEG OF PROFESSIONALISM IN HANDLING THE SITS.