CSX AC4400CW #290 as rear DPU on BNSF Grain Loads

There was a Southbound BNSF grain train on the old Western Pacific main from Keddie to Sacramento, with three BNSF CW44-9s on the front, three BNSF CW44-9s in the middle as DPU and a CSX AC4400CW #290 and a BNSF CW44-9 on the rear as DPU. This was around 4:25pm and was spotted just North of Sacramento.

CSXT 290 is not DPU equipped so I expect the BNSF it was MU'd with was the controlling unit.