China has high-speed rail. It's possible to make it work in a country with as much landmass as the US.
There's no reason not to have a few good trunk lines, Atlanta to Boston, DC to Chicago to Minneapolis to Seattle, Seattle to San Diego, Atlanta to LA, with spokes and connectors to larger cities off the trunk. Deutsche Bahn doesn't offer ICE service from Füssen to Marburg, but you can take the Regionalbahn from Marburg to Frankfurt, the ICE from Frankfurt to Munich, and the Regionalbahn from Munich to Füssen.
Then again, those damn socialist communists in Germany have it written into their constitution that the government must fund rail transportation to every town. It doesn't say how often or how fast, and some of the outlying farm villages have slow trains (that stop at every. damn. station, and some of these stations look like bus stops) that run every 2-3 hours, and less on holidays.
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There's no reason not to have a few good trunk lines, Atlanta to Boston, DC to Chicago to Minneapolis to Seattle, Seattle to San Diego, Atlanta to LA, with spokes and connectors to larger cities off the trunk. Deutsche Bahn doesn't offer ICE service from Füssen to Marburg, but you can take the Regionalbahn from Marburg to Frankfurt, the ICE from Frankfurt to Munich, and the Regionalbahn from Munich to Füssen.
Then again, those damn socialist communists in Germany have it written into their constitution that the government must fund rail transportation to every town. It doesn't say how often or how fast, and some of the outlying farm villages have slow trains (that stop at every. damn. station, and some of these stations look like bus stops) that run every 2-3 hours, and less on holidays.