You sent me down a rabbit hole, thank you, reading about the current state of Cascadia HSR, what it would take to make the current 79mph tracks capable of 110mph or 125mph (spoiler, 110mph is barely worthwhile and 125mph is an overt waste of effort), etc. The more I look at the numbers, the more I think the future does not look like HSR in the PNW. Wildly expensive, low ridership.

I wonder if we could not get most of the benefit by doing substantially cheaper options like separating freight from rail on major routes, electrifying parts of it where feasible. And maybe taking specific segments in areas where the track conditions are already favorable and increasing the maximum speeds on those segments. Probably two-thirds of the route between Portland and Salem, for example, is already suitable with modest upgrades to hit 125 mph. And basically all modern trains are capable of that speed already.