ACR ACFT TAXIES PAST RWY HOLD SHORT LINE OBSCURED IN SNOW AT ANC.

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AFTER DEICING THE ACFT AT THE GATE; I CALLED GND CTL FOR TAXI CLRNC. THE CLRNC RECEIVED; 'TAXI TO RWY 32 VIA TXWY L; TXWY E; TXWY K.' AFTER THE READBACK; THE GND CTLR CHANGED THE TAXI CLRNC TO 'TAXI TO RWY 32 VIA TXWY E AND TXWY K.' ANC METAR RPTED WAS: 210 DEGS AT 4 KTS; 3/4 SM - SN BR VV007 M03/M04 A29.16; RAMP AND TXWYS COVERED WITH ICE PATCHES AND FRESH SNOW. WE PROCEED DOWN TXWY E SBOUND. TAXI SIGNS WERE ALL COVERED WITH FRESH SNOW; MANY NOT READABLE. WHILE TAXIING S ON TXWY E; WE PASSED TXWY L. CAPT SLOWED OUR TAXI SPD DOWN TO A VERY SLOW SPD SO THAT WE COULD SEE TXWY K. OUR CONCERN WAS THAT IF WE COULD NOT SEE TXWY K AND PASSED IT THAT WE COULD WIND UP VERY CLOSE TO RWY 6L. THERE WERE STOP BAR LIGHTS AT THE END OF TXWY E AND ALSO TXWY G; WHICH TRANSITIONED AT AN ANGLE FROM TXWY E TO RWY 6L. WHILE STILL TAXIING AT A CRAWLING SPD; I STARTED TO MAKE OUT WHITE EDGE LIGHTS COMING INTO VIEW; CAPT STARTED SEEING THE WHITE EDGE LIGHTS TOO. HE APPLIED MAX BRAKES AND WE SLID TO A STOP. THE NOSE OF THE ACFT WAS PROTRUDING OVER THE LINE AND OUT ONTO RWY 6L. GND CTL THEN ASKED US IF WE WERE PROTRUDING INTO RWY 6L. WE ANSWERED; 'YES WE WERE.' I HEARD THE CTLR ISSUE A GAR TO A SMALL ACFT ON APCH TO RWY 6L. WE WERE TOLD TO HOLD OUR POS. AFTER WHICH; WE WERE LATER TOLD TO TAXI DOWN RWY 6L AND INTO POS FOR TKOF ON THE EXTENSION TO RWY 32. WE WERE CLRED FOR TKOF RWY 32 EXTENSION. THE REMAINDER OF THE FLT TO FAI WAS WITHOUT INCIDENT. THE PROB IS THAT WITH RESTR VISIBILITY DUE TO SNOW AND OTHER CONTAMINANTS ON THE GND; THE RWY STOP BARS AND LIGHTS BECOME COVERED AND IN MOST CASES UNABLE TO BE SEEN. PERHAPS TO PREVENT THE PROB OF RWY 6L INCURSION; THE TWR SHOULD CLOSE RWY 6L DURING TIMES OF RESTR VISIBILITY AND WHEN RWY 32 IS BEING USED FOR TKOFS IN SNOW OPS.