What appears to be a hot shot BNSF Z train, is actually a repo train from Phoenix, Arizona to Los Angeles, California. With no wye switch at Williams Junction, we saw this train earlier in the morning going east near Flagstaff. They typically swap ends and run the power around for this train at either, Canyon Diablo siding or Winslow, which is exactly what they did.
Here, the train is going west through the massive S curve at Eagle Nest, in the late golden sunlight, on the 2nd day of winter.