[dirtboy]

Further, a much more powerful explosive charge would be necessary to cripple a train - and even then, there would be survivors (as opposed to mid-air detonations).

Google 'Madrid 3/11' and get back to me about how al Qaeda can effectively wreak complete political havoc by targeting trains.

[Army Air Corps]

Don’t forget the Tokyo subway attacks and the attacks in London a few years ago.

[GonzoGOP]

You don’t even need explosives. Just pull out the spikes on the outside rail of a curve. As long as you don’t break the rail the signals will all stay green. A light weight train derailment at 200 miles per hour isn’t a whole lot different from a plane crash. Go look at pictures from the ICE wreck when it piled up under a highway bridge.