UP is in the midst of a major maintenance project on the Moffat. This particular piece of equipment is called a Tie Extractor/Inserter (TE/IE). A clamp on the side of the machine grabs onto a tie on the outside of the rail and pulls the tie out from under the rails. As you can see, not every tie along the rails is being replaced. The new ties are laying at (roughly) 45° angles to the rails. The old ties are perpendicular and will be picked up by the next piece of equipment.
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