Don't know. Is there a way to find out? Google maps seems to have the best resolution.
It looks like BNSF has concrete ties, UP wooden.
From
(looks like March 3, 2010?)
[
www.wheelsmuseum.org]
Iron Horse in a Digital Age
By Sherry Robinson
Albuquerque Tribune
...snip...
Improvements include adding 216 miles of track, and building 110 new bridges and culverts between Belen and Clovis.
"This was a long segment with single track," says Ice. "We effectively had a one-lane street. The places we could add capacity by adding track or changing the signaling system, we did."
After improvements, the route has just three remaining sections of single track -- Abo and Scholle Canyons in the Manzano Mountains, the Vaughan flyover and the Pecos River bridge at Fort Sumner. In the two canyons, the line snakes through twisting cuts for 4.7 miles. In Vaughan, BNSF passes over the Union Pacific line on a concrete span 1,500 feet long and 68 feet high. It would cost BNSF $15 million to build another one for double tracking.
The railroad is getting by despite these three bottlenecks, but at some point it may eliminate at least one -- probably the canyons.