BN is a very hobo friendly road. There is a daily NB out of K Falls on
BN for Vancouver, across the river from Portland - I would imagine you
could findout departure time in K Falls from BN - likely not a single
bull there. There is of course a southbound when you want to come back
(or what I'd recommend, combine it w/ an SP trip as Willamette Pass is
very nice). (The nice thing about BN north of K Falls is the DesChutes
River Canyon) There is also a train each way on BN between K Falls and
Pasco, but the scenery isn't as nice if that's what you're going for.
Through trains like the LABRF (Los Angeles-Brooklyn Yard Forwarder)
generally clear Klamath Falls fairly rapidly, while manifests can sit
around awhile, even be broken up and reassembled a bit, since this is
the Modoc Line junction, and drop point for local freight. Bulls are
fairly active in Klamath Falls (one's assigned there), and monitor
most incoming and outgoing trains.