B737 Next Generation Undifferentiated
Ground Excursion Taxiway
Airport; Weather; Human Factors; Environment - Non Weather Related
Landed Runway 10C at dusk; lightning and rain in the area; wet taxiways.  After crossing Runway 10L at CC directed to taxi L to Taxiway T10; hold short of 32L.  At the intersection of L and DD the taxiway does a 45 degree right turn. This is the old 10L pad. Captain made a comment; 'where did my taxi line go?'  Aircraft continued straight. I recognized we were approaching the taxiway edge and called out 'lights; lights'. Captain stopped the aircraft. Taxi speed was at or below 15 knots. The entire event occurred very quickly; approximately 5 seconds.  Contributing factors: 1. Environmental lighting and wet glare on taxiway.   2. The old paint from the 10L pad is still visible (though ground down).  This makes a Y at the incident point in the taxiway line.  3. [The Airport Diagram and the 10L Hold Pad inset] incorrectly shows the taxi line veering left; not right. The charts are incorrect and there is no current Construction Page.  4. The NOTAM for the 10L pad being closed does not mention the new taxi markings and change in direction.   5. There is a gap in the newly installed raised taxiway edge lights at the intersection of L.    Recommendations:  1. Update the NOTAM with the change in taxi direction and correct the Airport Diagram.  2. Review and correct the lighting to highlight the taxiway makes a right transition.  3. Remove the grind marks from the old taxi line.
B737 First Officer reports the old 10L hold pad at ORD at dusk with rain falling is challenging to see correct taxiway lines. The old taxiway lines; though ground down; are still visible and the Airport Diagram has not been updated and a construction page not issued for the work in progress.