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| | Rapid transit - Wikipedia, the free encyclopedia |
 | | A rapid transit, underground, subway, tube, elevated, or metro(politan) system is a railway system, usually in an urban area, with a high capacity and frequency of service, and grade separation from other traffic. |
 | | Two major subway systems, operated by the BMT and the IND were constructed later, and many pre-existing elevated railway lines were incorporated into the BMT and IRT systems. |
 | | The oldest subway in the Southern Hemisphere opened in 1913 in Buenos Aires, Argentina, which is also the oldest one in Latin America and the Spanish-speaking world. |
| en.wikipedia.org /wiki/Metro (4087 words) |
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