No. We are on Pepper Avenue looking east. The track 5401 is on leads to the departure yard and nowhere else. 5401 is light power, moving west You can see it is in the yard, because it is moving, but no headlights or ditch lights are on, which is OK in the yard but not on the main. 5401 has nowhere to go but the West Colton departure yard, where it will pick up its train. If you wait for this set of power to go under the bridge and then turn 180 degrees, you will see it continuing to move as in the photo below:
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The train above is on the fairly new track that connects the UP ex-SP Alhambra Sub main directly to the BNSF main leading north to Cajon Pass. If it were going to the Palmdale Cutoff, it would be taking the Alhambra Sub main a little farther to the west. The Cutoff passes over the track the stacker is on.