7 ms·

According to some quick youtube searching, armor-piercing rounds versus regular steel would create problems: http://youtu.be/q_zZd0NsYG4 http://youtu.be/q_zZd0N

• bloaf 13y ago
  Sure, so would high explosives directly on the tube. I am considering a situation that could conceivably be accidental because it is incredibly difficult to engineer something that can stand up to malice.
  • jlgreco 13y ago
    The bar to malice is important to consider. If the bar is "high explosives or shaped charges", then you are probably okay. If the bar is "a redneck who is bored with shooting stop-signs", then that might be a problem.
    • glibgil 13y ago
      Bored people don't shoot guns at trains today. Why would they start?
      • kingkawn 13y ago
        Because there's no possibility that shooting at a train would result in a fireball a thousand yards high, whereas...
        • count 13y ago
          How thick are propane tanker cars?
          • jlgreco 13y ago
            Back of the bar napkin calculation with Barlow's formula, assuming 200psi (about what bbq tanks are at iirc?), somewhere around half an inch.
      • louthy 13y ago
        Because the tube isn't a train?
      • jlgreco 13y ago
        Are you sure? I imagine most trains these days are pretty tolerant of that, it could easily go unnoticed.
      • JoeAltmaier 13y ago
        Bored people shoot track, put pennies on tracks, drop water balloons from freeway overpasses, put potatoes in car exhaust pipes, and on and on. Its important to consider the most random variable in the safety equation - bored people. I'd say all these concerns warrant putting the damn thing underground.