As someone who has regularly ridden Amtrak trains the past 15 years, I've actually always been surprised at the lack of passenger possession screening before boarding. Anyone can bring anything they want onto a train, at any time.

A lot of the comments here are laughing at the absurdity of a train hijacking, but I think the greater threat is someone or some group of people choosing a packed train as the very soft target it is for a domestic terrorist attack or mass shooting.

To be clear, most places in America are soft targets for people who want to perpetrate mass casualty events. But while generally people can run and hide, there is no where to run and nowhere to hide on a train.

I'm surprised we don't see more of it, being honest. Only a matter of time.