[ClumsyPilot]

Small electric planes do not fly as fast as the current passenger Jets, theor speed is going to be comparable to a high speed train.

In fact i'd say europe could avoid airplanes entirely if it could sort out it's rail network, but, alas, going from Londom to Prague I'd have to change like 6 trains. You have to cross many different national signalling systems, gauge sizes and ticket offices.

[iSnow]

Track gauge is the same all over western and central Europe. And Europe is slowly but surely moving towards ERTMS/ETCS() for train control. Different voltages and frequencies are a problem but less than in the past thanks to modern electronics.

https://en.wikipedia.org/wiki/European_Train_Control_System