B757 FLT CREW WAS INSTRUCTED TO HOLD SHORT OF RWY 05R AT MMMX. FLT CREW WAS UNABLE TO LOCATE 'HOLD SHORT' LINE AND CAME VERY CLOSE TO DISPLACED THRESHOLD OF RWY 05R.

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MY AIRCRAFT WAS GIVEN TAXI INSTRUCTIONS TO TAXI VIA TXWY B3 AND TXWY A1; AND HOLD SHORT OF RWY 05R AT A1. I (CAPTAIN) MENTALLY NOTED A FLIGHT PLAN NOTE THAT INDICATED THAT THE HOLD SHORT LINE ON TXWY A1 WAS 'POORLY MARKED.' I PROCEEDED TO TAXI AS INSTRUCTED; VISUALLY SEARCHING FOR HOLD SHORT LINE ON TXWY A1; AS WELL AS OTHER SUPPORTING VISUAL INDICATIONS OF RWY PROXIMITY; RELATIVE TO TXWY A1 AS THE TAXI PROGRESSED; I NOTICED YELLOW CHEVRONS PERPENDICULAR TO; AND AHEAD OF MY AIRCRAFT PATH (I BELIEVE THAT THIS WAS THE DISPLACED THRESHOLD OVERRUN AREA FOR RWYS 05R/23L). I STOPPED THE AIRCRAFT PRIOR TO YELLOW CHEVRONS; AND LOOKED LEFT TO OBSERVE ANOTHER B757 IN LANDING FLARE IN VERY CLOSE PROXIMITY TO MY AIRCRAFT. THE LANDING AIRCRAFT APPEARED TO LAND WITHOUT INCIDENT. I NEVER OBSERVED THE HOLD SHORT LINE ON TXWY A1; OR ANY OTHER MARKINGS; LIGHTS; OR SIGNS THAT REFLECTED THE INTERSECTION OR HOLD SHORT LINE FOR TXWY A1; AND RWY 05R; BUT I BELIEVE THAT I CROSSED IT AT SOME POINT; DUE TO CLOSE PROXIMITY OF LANDING AIRCRAFT; AS WELL AS THE OVERRUN MARKINGS. WHILE THERE WAS A WARNING REGARDING THIS PROBLEM; IN THE FLIGHT PLAN NOTES; IT WAS NONSPECIFIC IN NATURE. THE SPECIAL OPS PAGES FOR THIS AIRPORT DO NOT COVER THIS PARTICULAR INTERSECTION; AND THE DETAIL OF ARPT DIAGRAM DOES NOT ADEQUATELY DETAIL THIS INTERSECTION. I BELIEVE THAT THIS INTERSECTION WARRANTS A 'HOT SPOT;' AS WELL AS AN ADDITIONAL SPECIAL OPS PAGE WITH AMPLIFIED DETAIL OF THIS INTERSECTION.CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE REPORTER STATED THAT TXWY A1 IS A RELATIVELY NEW TXWY. COMPANY OPERATIONAL NOTES STATE THE INADEQUACIES OF THE MARKINGS IN THIS AREA. AN ADDITIONAL CHART WAS PUBLISHED BY THE COMPANY; BUT IT DOES NOT DEPICT THE INTERSECTION OF TXWY A1 AND THE RWY 05R DISPLACED THRESHOLD.