One more reason to just invest more in good high speed train infrastructure.
https://www.chronotrains.com/?zoom=4.4&lng=4.85&lat=49.23&st...
https://www.chronotrains.com/?zoom=4.4&lng=4.85&lat=49.23&st...
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.
A plane is a self-contained system and most people don't have access to surface-to-air missiles.