High speed train breakdown? Nah, with good expertise and maintenance that will not be likely.
I support Japan's Tokyu Cars, Kawasaki and Kinki Cars, those which made the Shinkansen trains too...
I vomitted the first time I took a Eurostar train, the pressure was too much and a bit hard to tahan... European tech, argh, still some way man, in terms of passenger comfort, the seats also cannot turn one, damn!