> 95%+ of North American intercity trains run on freight tracks, which are not designed to be as "smooth".
All over the US, the tracks are being upgraded to 110mph standards. It just a slow process: 5 miles here, 20 miles there. Whenever they can find the money they do a new section. Every single grade crossing must be upgraded, every single curve regraded, etc. Amtrak can run at 90mph on those sections with the locomotives they currently have.
Sometimes they string together enough upgraded rail. Essentially everything in Michigan has been running 110mph for 10+ years, with the newer Siemens locomotives that can handle it. Also, the Texas Eagle and Lincoln Service - the entire time they are in Illinois they are running 110mph.
Upgrading 5 miles of rail doesn't make the news. That doesn't mean it didn't happen :)
All over the US, the tracks are being upgraded to 110mph standards. It just a slow process: 5 miles here, 20 miles there. Whenever they can find the money they do a new section. Every single grade crossing must be upgraded, every single curve regraded, etc. Amtrak can run at 90mph on those sections with the locomotives they currently have.
Sometimes they string together enough upgraded rail. Essentially everything in Michigan has been running 110mph for 10+ years, with the newer Siemens locomotives that can handle it. Also, the Texas Eagle and Lincoln Service - the entire time they are in Illinois they are running 110mph.
Upgrading 5 miles of rail doesn't make the news. That doesn't mean it didn't happen :)