LGT TAXIES ONTO CLOSED TXWY. ACFT STRANDED WHEN 1 MAIN GEAR DEPARTS PAVEMENT INTO MUD.

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DURING TAXI IN; R MAIN FAILED TO STAY ON PAVEMENT. NORMAL ENG PWR WAS SUFFICIENT TO RETURN GEAR TO PAVEMENT AND CONTINUE TAXI WITHOUT DAMAGE OR INCIDENT. CREW WAS SOMEWHAT FATIGUED AFTER LONG DUTY DAY (ABOUT 12:40 HRS). RECOMMEND BRIGHTER TXWY LIGHTS TO IDENT TXWYS. THERE IS ALSO A LOT OF CONFUSION STILL AS TO WHETHER TXWY D IS CLOSED FROM RWY TO RAMP TO ACFT OVER 70000 LBS OR JUST RESTR. ACR 10-9 PAGE IN MANUAL SHOWS PART CLOSED BUT IT STILL HAS BLUE TAXI LIGHTS ON IT. SUPPLEMENTAL INFO FROM ACN 232627: DURING TAXI IN; MISTOOK TXWY D FOR C. SUPPLEMENTAL INFO FROM ACN 232339: THE CAPT TAXIED CLR OF RWY 2 AFTER THE COPLT'S LNDG; AND HAD THE AIRFIELD DIAGRAM DISPLAYED. WHILE I WAS RUNNING MY AFTER LNDG CHKLISTS; THE R GEAR SLIPPED OFF TXWY D. NO DAMAGE FOUND. ONLY MUD ON TIRES. WE STARTED #2 AND #3 AND GOT BACK ON TXWY; NEVER USING MORE THAN 1.3 EPR. THE CAPT DID AN EXCELLENT JOB AND RPTED THE EVENT TO COMPANY. COMPANY RPTED TO FAA. RECOMMENDED ACTION: WIDEN AND STRESS TXWY D FOR ALL OPERATORS. IT IS THE MOST LOGICAL TAXI RTE TO AND FROM GATE AREA TO PARALLEL TXWY. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: BLUE TXWY LIGHTS EXIST ON TXWY D BTWN TXWY A AND THE RAMP BUT THE CHART SHOWS THAT THE TXWY IS CLOSED (AN 'X' APPEARS ON THE CHART). OTHER LGT HAVE TAXIED SUCCESSFULLY ON THIS CLOSED SEGMENT AND CAPT MAY HAVE CUT THE TURN A LITTLE. RPTR ADMITS THAT HE DID NOT PAY ATTN TO THE NOTES ON THE CHART; ASSUMING THAT IT REFERED TO BIRDS IN THE AREA.