Originally Posted by
Poopiedoodle
didn't realize I'd need to box the bike on a train.
It's not the same kid of boxing as with flying. You don't need to remove the wheels. Remove pedals, rotate/twist bars and stem, lower seat post if your bike is tall and roll it into the box.
Another option is up the coast to Seattle via train then train to Whitefish, MT where you could explore Glacier National Park then ride back to Whitefish.