Good for Europe and Japan. Irrelevant to North America, unless somebody is willing to spend the money to get them certified here and build the production lines necessary.
I will disagree and agree on that from my travels.
All intercity/Country trains are mostly single level trains up to 20 cars longs. France has a large number of DD trains that are country to country compare to other countries. You will find the odd DD train going from country to country similar to GO, but mostly single. All my trains have been single and some of that has to do to the fact they are high speed train.
Our last leg of a trip from Copenhagen to Hamburg by 3 different train last year was an GO style RER 1:5 hour trip since lack of direct trains seating for that day. All our other trips for Italy, Switzerland, Germany, Sweden, Netherlands, Belgium and France were all single level trains last year.
Did a trip from Zurich to Geneva and back on a GO style train back in 2012 and not a nice ride.
You will find S-Bahn/RER both single and DD from 3 to 10 cars long based on GO style that are mostly EMU's . Some have locomotives at both ends, are like GO setup, to fully EMU's. Fully EMU's are mostly 3-5 car trains that are MU up as 4 sets of combinations
Have seen combination of single and DD equipment on one train 11 cars long being pull by an locomotive with no cab car. The video is up on YouTube of it shot in Brussels.
Basely, the equipment is the same as GO equipment, but fails to meet Amtrak requirements. Because of tunnel's requirements, the tops of the cars are more round and less standing height for the window seat rider over 6' that I have hit my head on the upper level a few times using any DD car.
GO new cab cars are a Europe model car that I first saw back in 2012 that were built by Bombardier Europe.
Until NA starts allowing Europe standards for Train equipment, VIA, Amtrak and other systems have to built over weight equipment.
Since Amtrak is going to market for new equipment, they should be pushing for Europe Standards to meet accessibility needs,. Those riders will be confined to the lower level at all times with very little travel area. Very costly as well lost of space to have an elevator in a car to get to the upper level. Having an accessibility rider on the upper level is a huge safety factor as much I support accessibility rider needs, it a no go.