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Rapid transit - Encyclopedia, History, Geography and Biography |
 | | A rapid transit, underground, subway, elevated, or metro system is a railway system, usually in an urban area, with a high capacity and frequency of service, and grade separation from other traffic. |
 | | The terms "rapid transit" or "metro" tend to view this as a less important characteristic and include systems that are entirely elevated or at ground level (at grade). |
 | | Before any plans were made for transit systems with underground tunnels and stations, several railway operators built tunnels for their trains, usually to reduce the grade of the railway line. |
| www.arikah.com /encyclopedia/Rapid_transit (4201 words) |
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