Subway
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A subway system or mass rapid transit, underground, elevated railway, metro or metropolitan railway system is an electric passenger railway in an urban area with a high capacity and frequency, and grade separation from other traffic[1]. Due the large flows of people, the relatively ‘openness’ of the systems and the potential to cause large-scale disruption and fear , subway systems are very vulnerable for security threats.
Footnotes and references
- ↑ From: http://en.wikipedia.org/wiki/Rapid_transit. Retrieved on April 5, 2012
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