I don't understand. Are the options kind of a long term warning of what Amtrak will be wanting a couple decades from now? Because if they are talking options for trainsets that are capable of 300-350 kph now, I would have thought the trainsets would be delivered within 5-10 years. Which would mean most of them would be retired by 2050.
(That number doesn't look like a year, it looks like a dinner reservation time...)
Anyway, I guess my point was that I was hoping that there would be 20-30 mile sections of NEC track that were capable of allowing 300 kph speeds sooner rather than later. 350 kph would be like getting biscuits with your beer, but on the east coast the short distances it would be possible probably wouldn't be worth the extra cost it would entail.
Again, I may be missing the obvious because I am not that familiar with what Amtrak is, or has been, planning.
The 300 to 350 kph speeds for the NEC came out of Amtrak's Next Gen NEC Vision plan from 2012 which envisioned new tracks for 220 mph operation between WAS and NYP by 2030. If Amtrak is buying new HSR trainsets that would be delivered in circa 2020 with a 20-25 year operating lifespan, then it follows to at least be open in the RFP for bidders to submit HSR trainsets that could operate at speeds above 160 mph for the 2030 time frame. But the reality is that there are major funding hurdles to modernize the existing NEC, expand its capacity, get the NEC to a state of good repair, and the really big ticket Gateway project.
IMO, getting multiple segments up to 160 mph speeds, getting Gateway built, replacing the RF&P tunnel and the movable bridges that are way past their replacement date, expanding to (mostly) four tracks on the WAS to WIL segment, and getting the NEC to somewhere in the ballpark of a state of good repair over the next 15-20 years would represent substantial progress and is more politically realistic. The long term planning for the NEC is now in the domain of the NEC Future EIS study and the NEC Commission, not so much up to Amtrak.