Not Amtrak locomotives. The Engines, cars, and tracks belong to Washington and Oregon State. Amtrak is a contractor, in this case, paid by those states to operate the line. It my be that the train crew were not Amtrak personnel. Two years ago they were using BNSF crews to operate the train.
That’s a fair enough point.
It’s just I’d reckon BNSF would insist on dealing with Amtrak in this case.
Other states, running *commuter* train operations, have had outfits such as Keolis contracted to run them. Results have been mixed (see MBTA).