From my limited experience on the German rails (Amsterdam - Berlin 5/6 times in the last 4 years) the mobile 4G/5G connection was pretty good. Only dropping off when travelling through very remote rural areas. In the Netherlands we have unlimited data subscriptions, I assume Germany has something similar? That should be enough to get some work done in the train :)
> From my limited experience on the German rails (Amsterdam - Berlin 5/6 times in the last 4 years) the mobile 4G/5G connection was pretty good. Only dropping off when travelling through very remote rural areas.
Not sure what you'd call "very remote rural areas", but when on the main rail lines through Bavaria (Munich-Rosenheim-Salzburg-Vienna and -Rosenheim-Innsbruck-Verona) if you're in the countryside you'll often experience patchy or zero mobile coverage, never mind 4G/5G.
Unlimited data here is rare (or too expensive), usually normal people have 5-10gb a month. Still it covers most web and messaged stuff, just don’t watch too much video….