neroden
Model S Owner and Frustrated Tesla Fan
I don't understand the point of the regional rail speed of up to 125 mph. If we're going to spend billions of dollars and entice people to use rail, I think the high speed rail makes more sense. I guess it comes down to cost though and I imagine the regional rail is simply cheaper.
Well, in the US this is pretty much the case.
However, for an example of why you might want the up-to-125-mph trains, look at Switzerland. There, they devise the schedule they want, and then they build exactly the amount of rail necessary to achieve the schedule. Being Switzerland, of course, the trains leave at sub-second precision.
In the Cascades corridor (Vancouver-Seattle-Portland-Eugene), the analysis showed that it would be incredibly popular at 110 mph (which will get you from Seattle to Portland in under two hours) and going to 220 would multiply the construction costs by a very large factor without increasing ridership much. (It would not, in fact get you from Seattle to Portland in under one hour, due to hard-to-avoid slow zones at either end.)
In the SF-LA corridor, a similar analysis showed that anything less than 220 would be a lot less popular and a lot less useful.
Sadly, similarly solid analyses have not been made for most of the other corridors. Fan groups have come up with substantially better plans for a number of the Chicago-centered corridors, but they haven't really gotten traction. The Empire Corridor (NY-Albany-Buffalo) could benefit greatly from some major, truly high speed routings, but nobody's even seriously considered it. The choice of Detroit-Chicago route is driven entirely by the fact that Amtrak owns the right-of-way.