I was taking a train from somewhere in Bavaria to Austria. More than half of the ride the train lady was chilling next to us because "there is no internet, I cannot check tickets" the whole ride you could see houses out of the window. People are actually living there. This was like 6 years ago but I am still baffled by this.
In Switzerland it's very unlikely you find a mountain or road without 4g
"Today passengers enjoy at least 200 Mbit/s on 99 per cent of the 7 800 kilometres of main lines and even 300 Mbit/s or more on 95 per cent. Secondary lines also saw a transformation. Coverage of 100 Mbit/s rose from under 83 per cent to over 96 per cent in just three years."
However:
"Yet coverage is only half the story. Mobile signals must penetrate each carriage’s interior if passengers are to make calls or stream without interruption. Many modern trains are fitted with factory-installed windows engineered for signal permeability."
And of course many train's aren't fitted with windows like that (and operators are trying to retrofit them with microcells or in other ways).
In Switzerland it's very unlikely you find a mountain or road without 4g