Perhaps Amtrak should reroute the Chief to the BNSF southern freight mainline and bypass ABQ. A bus could be run between ABQ and Gallup or Belen. This would most likely make more sense than a 400 mile bus trip since the distance between ABQ and those cities is much shorter.
It doesn't make any sense to take Chicago / LA passengers on a 400 mile bus ride in the middle of their trip.
Of course, BNSF would most likely object to the train running on the already crowded southern mainline.
NH Joe