Can anyone clarify whether BNSF or MRL was operating this train?

I read one article that say the train was operated by BNSF, but other articles say it was MRL. I believe the track belongs to MRL, so their dispatcher would control the train.

Does BNSF have trackage rights on this section of the MRL? If so, that would support comments that BNSF was running the train through to Renton, where the Boeing plant is located.
Unfortunatley, you can't tell by the locomotives, as power is often shared.

Thanks in advance.