That's good quality track for a siding... very nice shot.
The track is a set out track for MOW equipment, rather than a siding in the usual sense and the track is only about 100 -200 yards long.
BNSF has a number of these set outs along the Needles Sub. and you will see MOW equipment on them fairly regularly. Siberia is another popular spot to rail and de-rail MOW equipment on this Sub.
I like the all “EMD” line up!