LGT BEING MARSHALLED INTO PARKING HAS WING TOP HIT LOADER.

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TAXIING INTO OAK RAMP AREA; WE WERE ASSIGNED BY COMPANY NOSEDOCK #2; UPON ENTERING RAMP AREA A GREEN LIGHT WAS OBSERVED ABOVE OUR GATE TELLING US GND SUPPORT WAS READY FOR US TO TAXI IN. WE SIGNALLED TO MARSHALLER AND HE BEGAN TO WAVE US IN WITH WANDS. APPROX 10 FT FROM FINAL BLOCK IN POINT WE FELT A BUMP ON ACFT; MARSHALLER CONTINUED TO SIGNAL US INTO GATE; NEVER EVEN SLOWING WAND RATE. I FLASHED THE TAXI LIGHT TO MARSHALLER TO SIGNAL HIM TO CHK THE AREA. HE CAME BACK TURNED NOSEDOCK LIGHT TO RED AND SIGNALED A SHUTDOWN. WE PERFORMED A ENG SHUTDOWN CHKLIST AND TERMINATING CHKLIST. UPON OPENING MAIN ENTRY DOOR IT WAS APPARENT THE L WING HAD STRUCK THE RAILING OF A LOADER WITH THE RAILING EMBEDDED APPROX 2 FT INTO LEADING EDGE OF WING. THE STRIKE POINT WAS APPROX 5 FT INBOARD FROM WING TIP ON LEADING EDGE. ON THIS RAMP THERE ARE NO 'FOUL' LINES PAINTED TO ALERT CREW OF HAZARDS IN THE WAY; WE ARE TOTALLY DEPENDENT ON GND PERSONNEL FOR MARSHALLING IN. THE CREW WAS EXTREMELY FATIGUED HAVING STARTED THE PREVIOUS EVENING AT XXXX AND FLOWN ALL NIGHT; ARRIVED OAK APPROX XA30 AM LCL. GND PERSONNEL ALSO COULD NOT SEE WING TIP AS BUILDING CONSTRUCTION PREVENTS THE VIEW. IN AN LGT THE WING TIPS NOT VISIBLE FROM COCKPIT. WING SPAR IS WHAT STOPPED ACFT FORWARD MOVEMENT AND SLOW TAXI SPD.