ACR X POTENTIAL UNAUTHORIZED RWY ENTRY NON ADHERENCE TO ATC CLRNC (USED WRONG TAXIWAY). PLTDEV.

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ACR X DEPARTED ACR GATE AND CONTACTED SFO GND CTL APCHING TAXIWAY. WE WERE INSTRUCTED TO TAXI TO RWY 28 VIA THE INNER (A) TO F (SEE ACCOMPANYING DIAGRAM) TO CROSS RWYS 5L/R. AS WE APCHED D TAXIWAY; GND CTL INSTRUCTED US TO JOIN THE OUTER AT D BEHIND A WDB EXITING AT E GOING TO THE INTL TERMINAL. AS WE APCHED E TAXIWAY MOVED TO THE OUTSIDE (NE) PART OF THE E TAXIWAY TO CLR THE WDB. AT THIS POINT WE CONTINUED TO FOLLOW THE GREEN TAXIWAY CENTERLINE LIGHTS. AT THE SPOT MARKED BY THE X ON ACCOMPANYING DIAGRAM; WAS TOLD TO 'HOLD OUR POS; YOU ARE ON TAXIWAY J.' WE STOPPED ABRUPTLY. WE WERE THEN CLRED TO TAXI ONTO RWY 28L FOLLOWED BY A R TURN ONTO RWY 19R TO F THEN L ON F TO THE 28 RWYS. NOT UNTIL CLRED; DID WE TAXI ONTO RWY 28L. THERE WERE NO ACFT ON 28L AS WE TAXIED ONTO J. THE CAUSE OF THIS INCIDENT IS ATTRIBUTED TO THE CONFUSION IN CLRING THE REAR OF THE WDB AND THEN CONTINUING TO FOLLOWING THE GREEN TAXIWAY CENTERLINE LIGHTING TO THE INCORRECT TAXIWAY. BOTH CAPT AND FO UNAWARE OF TAXIWAY DEV UNTIL CALLED BY GND CTL. SUGGEST AREA OF TAXIWAYS A AND B AT E BE EXAMINED TO IMPROVE PAINTING OF MARKINGS AND LIGHTING IN THIS AREA. THIS CREW WAS UNAWARE OF THE DEV. SUPPLEMENTAL INFO FROM ACN 194456: WE WERE CLRED VIA THE INNER TO FOXTROT AND CLRED TO CROSS RWYS 1L AND 1R AND TO TAXI TO 28. ON THE WAY OUT WE WERE GIVEN INSTRUCTIONS TO TRANSITION TO THE OUTER AT ECHO AND FOLLOW A WDB. WE MADE THE TRANSITION AND THEN MADE THE NEXT LEFT TURN WHICH WAS JULIET; THE HIGH SPEED EXIT OFF OF RWY 28L. BEFORE REACHING THE RWY GND CALLED FOR US TO STOP IMMEDIATELY BECAUSE WE WERE ON RWY 28. WE DID NOT ACTUALLY GO ONTO THE RWY . WE WERE ABOUT 30 YARDS FROM THE EDGE OF THE RWY. I BELIEVE HOWEVER THAT HAD THE CTLR NOT CALLED US WE MIGHT HAVE CONTINUED ONTO THE RWY. NEITHER ONE OF US FELT WE WERE IN THE WRONG PLACE; BUT WE WERE. I FEEL CONTRIBUTING FACTORS WERE US WATCHING THE WDB TAXI IN FRONT OF US AND THEN BECOMING A LITTLE CONFUSED ON WHERE WE WERE. WE BOTH HAD THE ARPT DIAGRAMS OUT BUT DID NOT LOOK AT THEM BECAUSE WE BOTH KNEW WHERE FOXTROT WAS. WE JUST GOT CONFUSED. ALSO THE GREEN TXWY CENTER LINE LIGHTS ON THE HIGHSPEED LED US TO BELIEVE WE WERE ON THE CORRECT TXWY. MYSELF AS THE COPLT WAS PROBABLY NOT CONCERNED ENOUGH WITH WATCHING THE CAPT AND DOUBLE CHKING OUR POSITION AS OFTEN AS I SHOULD HAVE. I WILL BE MORE VIGILANT IN THE FUTURE.