For all those saying that there are no security checks on trains: perhaps you have never been on the Spanish Alta Velocidad from Zaragossa to Barcelona. When I took that some years ago my luggage had to go through an X-ray machine and I had to go through a metal detector.
I don't know if they still do that but it is certainly something that could be instituted if governments wanted it.
I don't know if they still do that but it is certainly something that could be instituted if governments wanted it.