Going by memory, I think BNSF traffic is limited to military trains and perhaps a local.
And I found this on the Googles:
[
www.wsdot.wa.gov]
The track where the derailment occurred – known as the Lakewood Subdivision or the Point Defiance Bypass – is owned by Sound Transit, which also operates its Sounder commuter trains over a portion of it. BNSF dispatches trains over the bypass.