[pjc50]

Yes, although for terrorism purposes why is this tactially useful given the high cost and complexity? It's not particularly easy to build a 3km/s railgun in your garage, and the power storage ends up being hugely bulky.

Conventional terrorist attacks involving homemade explosives, firearms, mortars, and even rockets have been quite cost-effective enough. I'm more worried about someone combining quadcopters and explosives.

[goldenkey]

I suppose you're right. Its fun to think about the massive power of railguns and their simplicity though.