This short spur was constructed westward from Jornada, NM off of the main AT&SF line to the site of the Elephant Butte Dam construction, around 1910. The resulting lake was at one time the largest man-made reservoir in the world. Portions of the old grade are still visible along State Road #15 between Jornada and Truth or Consequences, NM.
Thanks to Dr. James H. Olsen, Jr., PE for contributing information.
The State Road should be #51, not #15; looks like the digits got transposed. thanks.
We were just hiking in that area this morning and commenting on the cuts made for the railroad. There must have been a trestle over Ash Canyon. Does a photo exist of that? Great map - thanks!