It’s surprising that this doesn’t already exist. It’s already made quite easy to commute between Washington and BC. A decent train line to Portland opening another easy link with Oregon makes sense. I suppose the infrastructure is currently built for cars and planes. But if both countries get serious about carbon emissions, it makes sense to massively expand the rail network down the whole west coast. It would still be a trek, but with a high speed rail, it could become feasible to add California as one fast train from Vancouver.