What are you going to do with a hijacked train? The moment you hijack it they’ll just shutdown power. Hostages? Good luck there are like 30 carts on the train all of which have window break tools and emergency door open tools.
Look at Germany or France. High speed trains are everywhere and there is no ID requirement beyond maybe a ticket check if you’re unlucky.
Ok. Thinking explosives. Where are high speed trains being attacked by explosives? I don’t hear much in Germany, France, China, or Japan.