High Quality Content by WIKIPEDIA articles! A metro system is a rapid transit train system. In some cases, metro systems are referred to as subways or undergrounds. The first metro system, the London Underground, was opened in 1863. As of 2010, there are approximately 160 metro systems in the world. The biggest metro systems in the world by length of routes and number of stations – New York Subway, by length of lines – London Underground and Shanghai Metro. A metro system is defined as an urban, electric passenger transportation system with high capacity and high frequency of service, which is totally independent from other traffic, road or pedestrians. The terms heavy rail (mainly in North America) and heavy urban rail often have similar definitions. The dividing line between metro and other modes of public transport, such as light rail and commuter rail, is not always clear. A common way to distinguish metro from light rail is by their separation from other traffic. While light rail systems may share roads or have level crossings, a metro system runs, almost always, on a grade-separated exclusive right-of-way, with no access for pedestrians and other traffic.

Данное издание не является оригинальным. Книга печатается по технологии принт-он-деманд после получения заказа.