NIGHT TAXI; SNOW COVERED TXWYS; PARTIALLY PLOWED; IN TURN TO INTERSECTING TXWY ACFT SLIPPED OFF THE L SIDE. PAX DEPLANED AND ACFT TOWED.

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WE WERE CLRED TO TAXI TO RWY 23L VIA TXWYS C AND A. FOR SOME REASON THE GND CTLR ASSIGNED TXWY C INSTEAD OF TXWY D WHICH INTERSECTS IN A MUCH LARGER PAVED AREA. FIELD CONDITIONS WERE PACKED SNOW AND ICE. TXWY A WAS PLOWED 50 FT WIDE. TXWYS C AND D WERE PLOWED; BUT NO CTRLINE MARKINGS WERE VISIBLE ON ANY TXWY. BRAKING ACTION ON THE TXWY WAS DESCRIBED AS POOR. BLUE TXWY LIGHTS WERE STICKING OUT OF THE SNOW. UNKNOWN TO ME THE PLOWED 50 FT STRIP ON TXWY WAS NOT DOWN THE CTRLINE BUT TO THE W SIDE OF THE TXWY. AS THE L TURN FROM TXWY C TO TXWY A WAS COMMENCED THE NOSE WAS PLACED AGAINST THE BERM WHICH APPEARED TO BE THE CROWN OF THE TXWY. THE ACFT APPEARED TO SLIDE TO THE L AND REASONABLE PWR WOULD NOT MOVE THE ACFT. AN ARPT VEHICLE CONFIRMED THE L MAIN GEAR WAS OFF THE PAVEMENT; BUT INSIDE THERE IS NO MENTION OF THIS FACT IN THE ARPT DIAGRAM. THE ACFT ENGS WERE SHUT DOWN. STAIRS AND BUSES WERE BROUGHT TO THE ACFT. PAX AND CREW DEPLANED AND RETURNED TO THE TERMINAL. THERE WERE NO INJURIES AND NO DAMAGE. ACFT WAS TOWED TO THE GATE BY MAINT. I FLEW THE ACFT TO AFW ON JAN/TUE/96. I WOULD LIKE TO COMMEND ALL THE COMPANY EMPLOYEES AT RDU FOR THEIR WORK IN HANDLING THE PAX AND RETRIEVING THE ACFT UNDER DIFFICULT CONDITIONS.