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| | Rapid transit (Site not responding. Last check: ) |
 | | A rapid transit, underground, subway, elevated, or metro system is a railway system, usually in an urban area, that usually has high capacity and frequency, with large trains and total or near total grade separation from other traffic. |
 | | In London, the Tower Subway provided a crossing under the River Thames using a tiny cable car for the 410-m journey; the line closed in a matter of months and the tunnel was given over to pedestrians, later becoming a utility conduit. |
 | | The Toronto Subway (1954) used the first aluminum subway car (which was at the time also the longest car in the world), which reduced weight and therefore operating costs. |
| www.punweb.com /article/Subway (5020 words) |
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