[reaperducer]

In the US, once you leave the East Coast, you're on freight rails which are bumpy and annoying.

Yeah. In a few spots, it's OK, but the majority of it is pretty bad. I take a lot of long-distance Amtrak trips, and sleeping can be hard if you haven't done it in a while and you're not used to it.

I was surprised to find that the Shinkansen in Japan is a pretty rough and unstable run, too.

Americans on the internet like to imagine Japan and its technology as perfect in every way, but the HSR between Tokyo and Kyoto can be almost sea-sickness worthy.

I don't think this is because of bad rails so much it is that the infrastructure is so heavily used, and aging, since Japan was a pioneer in this arena.

[lovemenot]

I have used that particular Shinkansen route at least thirty times in each direction. Admittedly not so much recently. I have also traveled by high speed rail in Northern Europe, for comparison.

Your experience on the Shinkansen is very different from mine. The only explanation I can imagine is that your train was travelling slowly, which can happen - rarely - in typhoon season.

Otherwise, which high speed lines have you used that did not induce seasickness in you?

[reaperducer]

It wasn’t the slow train. I had my wife with me so I splashed out for the fastest train available. It was around 7am, so I assume it was rush hours.

I’ve taken a few high speed routes around the world. KTX between Seoul and Busan. The entire Eurostar route. Others I can’t remember off the top of my head.

The best experience so far has been Trenitalia between Rome and Naples.

[lovemenot]

I did not mean to imply that slower trains such as Hikari or Kodama on that route might make one nauseous. Rather on very rare occasions, a too-slow train would let you feel the side-to-side as it banks.

Well anyway it seems to have been just a one-time experience, from which you've managed to deduce both generality and cause.

Again, from experience that's not common, so perhaps a more charitable explanation than system degradation might have been warranted. Certainly the rolling-stock is much newer than the system. The Nozomi you used would have been, at a guess 15 years or younger.

[jimjimjim]

i found the shinkansen to be smooth and blissful. (sorry can't remember which one. from tokyo to somewhere to ski)