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It would only take a couple of terrorist incidences on the train to make the experience as painful as flying already is.

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Trains can be and have been blown up. But that's mostly harmless compared to the horrors that could be done to a fully occupied road tunnel with a few well coordinated trucks. Should we stop building roads?

Planes are an exceptional target because they can be deviated to foreign countries or to dramatic impact sites and because are so isolated while in the air. Neither applies to trains.

Also perfect train security doesn't protect against something on the track, and you can't adequately protect thousands of miles of track. You can reduce, but not eliminate, the risk.

A plane is a self-contained system and most people don't have access to surface-to-air missiles.

Poland doesn’t have these problems, I wonder why?

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