Sorry Tim there are not any VHF P25 repeaters in the Seattle area. There are a couple of 70cm repeaters however.
Not sure if the train goes near Spokane but last I heard there was one in the Spokane area.
Disregard, it looks like the 2m repeater is gone.
Washington P25 Amateur Radio Repeaters
Do you have a P25 portable? If so shoot me a PM and we can set up a P25 VHF QSO. I have a XTS5000R.