Mobile phone signals seem to be interrupted very often when travelling by train. I have been wondering why exactly, and found two reoccuring explanations online:
The train acts as a faraday cage, and so blocks radio waves.
The train is moving too fast for a clear signal to be received.
Both of these arguments, however, seem also to hold for cars (inside which I have never experienced signal loss). I have seen the faraday argument debunked for cars, and assuming that trains then are also not really faraday cages, I am left in the dark as to why my phone loses signal in a train. Any ideas?