On the subject of rolling stock, what is known about the proposals for the trains running on HS2?
I heard one company is going with a double decker proposal! Maybe a derivative of the new French TGV's as they're supposed to be both relatively cheap, as well as efficient as well as looking really good! (A two floor bar sound good to anyone? )
Is there any high speed wheeled rolling stock that runs at or is capable of running at 225mph?
All of the bids I am aware of have specified single deck stock. As far as I'm aware, the train order for HS2 Phase 1 is intended to be one homogenous fleet of 54 trains, given the high number of services that will run onto the classic network the number of 'captive' double-deck sets that could be built would surely be quite small.
More detail on the HS2 rolling stock requirements and proposed bids can be found at this link:
https://www.railjournal.com/in_depth/five-compete-for-2-75bn-hs2-fleet-order
There are five bidders for the HS2 rolling stock contract, to supply at least 54 trainsets capable of 360km/h for Phase 1 of HS2;
Hitachi Rail/Bombardier Traction joint bid
Siemens
Alstom
Talgo
CAF
As far as I am aware Hitachi/Bombardier are focusing their efforts on the AT-400 "British Bullet Train", featuring between 10 and 12 single deck 25 metre carriages:
https://www.railwaygazette.com/news...veils-at400-british-bullet-train-concept.html
Siemens have said that they will offer HS2 a variant of their new Velaro Novo high-speed train, which premiered at InnoTrans 2018:
https://new.siemens.com/global/en/p...h-speed-and-intercity-trains/velaro-novo.html
Alstom have already provided their 220mph (360km/h) distributed traction AGV to Italian open access operator NTV, and I suspect they would offer something similar for HS2:
https://en.wikipedia.org/wiki/AGV_(train)
A double deck "AGV Duplex" is in the works that might be capable of 250mph (400km/h), and while Alstom did previously moot such a double-deck design for HS2, with separate power cars, back in 2016 it won't happen for Phase 1:
https://www.railwaygazette.com/news/single-view/view/acela-influences-alstoms-hs2-concept-train.html
Talgo have previously produced the Talgo 350, which operates at up to 220mph, and since 2009 have been developing the Talgo "AVRIL" capable of up to 240mph, which won its first production contract in November 2016. Talgo are developing an Avril UK variant for HS2 use, which will retain Talgo's method of articulation but will feature distributed traction rather than separate power cars. The computer generated renders for Talgo HS2 stock appear to show a more traditional streamlined aesthetic than the "duck billed" frontage found on the Talgo 350 and "AVRIL". Talgo have plans to build a train assembly plant at Longannet in Scotland should they bid successfully.
Fellow Spanish manufacturers CAF were latecomers to the party, only being added to the HS2 rolling stock shortlist, originally announced in November 2017, in June 2018, subsequently resulting in Talgo launching a legal bid against HS2 for mishandling the procurement programme. Were CAF successful, they have stated that they would build the trains at their newly opened factory in Newport, Wales. CAF intend to offer something derived from their Oaris family of high speed trains:
https://en.wikipedia.org/wiki/CAF_Oaris