SF34 CREW AND AN MD80 ALMOST COLLIDED ON TAXI IN AT IAD.

Narrative

MY SCHEDULE THAT DAY WAS TO FLY FROM PHL ARPT TO IAD ARPT; ARRIVE AT XA00. WE DEPARTED EARLY NEXT MORNING AT XH00. THE FLT WAS DELAYED DUE TO WX IN THE BOSTON AREA. I DID NOT DEPART PHL UNTIL XA30. THE FO FLYING WITH ME STATED THIS WAS HIS 4TH TIME DOING THIS TYPE OF OVERNIGHT. HE STATED TO ME THAT 2 NIGHTS BEFORE THAT; DISPATCH HAD HIM AND ANOTHER CAPT FLY UP TO ANOTHER ARPT TO GET ANOTHER AIRPLANE. HE STATED HE ONLY HAD 2 HRS OF SLEEP THAT NIGHT. HE ALSO STATED TO ME HE FELT LIKE HE WAS SUFFERING FROM EFFECTS OF LACK OF SLEEP. HE SAID HE CANNOT SLEEP DURING THE DAY. THE FLT TO IAD WAS UNEVENTFUL. I; AS CAPT; WAS FLYING. IT IS ACR POLICY THAT PNF HANDLES ALL RADIO TFC. WE LANDED ON RWY 19R AND ACR Y MD80 LANDED ON RWY 12. THE ARPT AT THAT TIME OF NIGHT HAS BOTH LCL CTL AND GND COVERED BY 1 PERSON. I WAS TOLD TO TAXI AND HOLD SHORT OF THE RAMP AND CONTACT RAMP CTL. MY FO THOUGHT HE WAS TALKING TO THE RAMP CTL -- INSTEAD HE WAS TALKING TO ACR Z OPS WHO DOES NOT CTL THE RAMP AREA. THE ACR Z OPS TOLD US TO TAXI INTO THE RAMP AREA. MY FO; THINKING IT WAS THE RAMP CTL; RESPONDED BACK TO HIM. MEANWHILE; THE ACR Y MD80 LOOKED LIKE HE WAS HOLDING FOR ME TO GET BY. I STARTED TO TAXI INTO THE RAMP AREA. THE ACR Y JET; WHO WAS AT MY 2 O'CLOCK POS; STARTED TO TAXI IN. WE BOTH SAW EACH OTHER AND I WAS ABLE TO GET AROUND HIM. AT NO TIME DID THE ACFT TOUCH EACH OTHER OR PUT THE PAX IN ANY DANGER. THE PROB AT IAD IS 1 CTLR DOING 2 JOBS. THE OTHER IS WITH THE FLT DELAYED AND MY FO TIRED FOR LACK OF SLEEP. OUR ACR DOES NOT UNDERSTAND HOW LACK OF PROPER REST EFFECTS THE FLC. THIS IS NOT THE FIRST TIME THIS HAS HAPPENED. THE ACR Z OPS SHOULD NOT CLR ACFT INTO THE RAMP AREA. IAD ARPT SHOULD HAVE MORE CTLRS WORKING THAT LATE AT NIGHT.