UNFAMILIAR WITH PUB ARPT; FLT CREW OF B737-300 CROSS FADED HOLD LINE OF RWY 26L WHILE TAXIING TO RWY 26R.

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DIVERTED TO PUB FOR THUNDERSTORMS IN DEN. REFUELED AND REDISPATCHED IN PUEBLO; AND ON TAXI OUT GND CTL TOLD US TO TAXI TO RWY 26R. WE STARTED TAXI AND WE HAD TO CALL DISPATCH VIA CELL PHONE TO GET PERF INFO ON RWY 26R. THEY HAD BEEN REPORTING USE OF RWY 17 ON ATIS; SO WE HAD NOT GOTTEN THE PERF FOR RWY 26 WHEN WE SPOKE EARLIER WITH DISPATCH. NO COM VIA ACARS IN PUB SO I CALLED DISPATCH ON MY CELL PHONE WHILE THE CAPT WAS TAXIING. WE HAD BEEN PARKED ON THE MAIN RAMP WHICH INTERSECTS RWY 26L. NO GATE IN PUB. WHEN WE TURNED OUT TOWARD RWY 26R WE WENT OVER THE POORLY MARKED HOLD LINES FOR RWY 26L. THE RAMP AND THE RWY ARE THE SAME PAVED SURFACE WITH ONLY FADED HOLD LINES MARKING THE RWY. NO MENTION WAS MADE BY ATC; AND NO OTHER ACFT WERE AFFECTED BY OUR INCURSION. NOTHING IS DENOTED ON THE COMMERCIAL CHART PAGE AS A HOT SPOT.CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE CAPT ADVISED THAT THE EVENT OCCURRED IN DAYLIGHT HRS AND THE RAMP WAS CLR AND DRY. THE ONLY DIFFICULTY IN SEEING THE RWY WAS THE FADED MARKINGS.