ICE is the worst transport, compared to the local lines that are now provided by commercial companies - I'm not talking about being on time (it's a fantasy), but Internet in the train itself in 2019th doesn't work at all. I used it regularly in 2018th, and it was ok - I could use that time to write a report in google docs, push some code, find information, etc. In 2019th, it simply doesn't work - I gave up, and either tether from my phone (if there is a signal), or just sit and read.
The coverage in Germany is really bad outside of the cities, area between Kassel and Fulda, and then further to the south is just a black hole. But when you enter into Austria on a train, you can say this just by seeing how fast internet is in the train, and there is a strong mobile signal...
Another issue on the third generation of ICE is that the windows have a coating meant for blocking out heat which is also very good at blocking cell signal.
The provided wifi is done via external antennas and multiple carriers and usually quit a bit better, however there are still long parts where it's unavailable as well. Also quite limited at 200MB of volume.
The coverage in Germany is really bad outside of the cities, area between Kassel and Fulda, and then further to the south is just a black hole. But when you enter into Austria on a train, you can say this just by seeing how fast internet is in the train, and there is a strong mobile signal...
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