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      Knowledge is Power

      Scientific American May 1929

      Is the Engineer Alert?

      Train Control Apparatus Stops Train Automatically if for Any Reason the Engineer Fails to Respond to Signals

      • May 1, 1929

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      More in the May 1929 issue of Scientific American
      • New Discoveries at Ur
      • Our Point of View, May 1929
      • The Three Best Light Planes
      View Full Contents
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