I seem to recall the Spanish doing security checks on high-speed rail passengers due to terrorist fears ...............
I got caught up in a security "scare" in Valencia after the Madrid train bombing (2004 ?). This was the ultimate example of
"we must be seen to be doing something" - no matter how pointless !! There was full airline style security for all the long distance trains (to Madrid, Barcelona etc), with queues stretching across the station and down the roads outside.
But.........my local train back out to Xeraco didn't even have a ticket check................and it was the local commuter trains that were bombed in Madrid !
If terrorists were looking for a target they couldn't have asked for anything better than the queues in and around Valencia Station.