Rapid transit

The New York City Subway is the world's largest single operator rapid transit system by number of stations, at 472.
The Shanghai Metro is the largest metro system by route length.
The London Underground is the world’s oldest metro system

Rapid transit or mass rapid transit (MRT), also known as heavy rail, metro, subway, tube, U-Bahn or underground, is a type of high-capacity public transport generally found in urban areas.[1][2][3] Unlike buses or trams, rapid transit systems are electric railways that operate on an exclusive right-of-way, which cannot be accessed by pedestrians or other vehicles of any sort,[4] and which is often grade separated in tunnels or on elevated railways.

Modern services on rapid transit systems are provided on designated lines between stations typically using electric multiple units on rail tracks, although some systems use guided rubber tires, magnetic levitation, or monorail. The stations typically have high platforms, without steps inside the trains, requiring custom-made trains in order to minimize gaps between train and platform. They are typically integrated with other public transport and often operated by the same public transport authorities. However, some rapid transit systems have at-grade intersections between a rapid transit line and a road or between two rapid transit lines.[5] It is unchallenged in its ability to transport large numbers of people quickly over short distances with little to no use of land.

The world's first rapid transit system was the partially underground Metropolitan Railway which opened as a conventional railway in 1863, and now forms part of the London Underground.[6] In 1868, New York opened the elevated West Side and Yonkers Patent Railway, initially a cable-hauled line using static steam engines.

China has the largest number of rapid transit systems in the world with 31 cities and 4567.56 Km of rail [7]. The world's longest single-operator rapid transit system by route length is the Shanghai Metro.[8][9] The world's largest single rapid transit service provider by number of stations (472 stations in total)[10] is the New York City Subway. The busiest rapid transit systems in the world by annual ridership are the Tokyo subway system, the Seoul Metropolitan Subway, the Moscow Metro, the Beijing Subway, the Shanghai Metro, the Guangzhou Metro, the New York City Subway, the Mexico City Metro, the Paris Metro, and the Hong Kong MTR.[11]

Terminology

A very crowded Paris Métro subway car.

Metro is the most common term for underground rapid transit systems used by non-native English speakers.[12] Rapid transit systems may be named after the medium by which passengers travel in busy central business districts; the use of tunnels inspires names such as subway,[13] underground,[14] Untergrundbahn (U-Bahn) in German,[15] or the Tunnelbana (T-bana) in Swedish;[16] the use of viaducts inspires names such as elevated (L or el), skytrain,[17] overhead, overground or Hochbahn in German. One of these terms may apply to an entire system, even if a large part of the network (for example, in outer suburbs) runs at ground level.

In most of Britain, a subway is a pedestrian underpass; the terms Underground and Tube are used for the London Underground, and the North East England Tyne and Wear Metro, mostly overground, is known as the Metro. In Scotland, however, the Glasgow Subway underground rapid transit system is known as the Subway. In most of North America, underground mass transit systems are primarily known as subways, whereas the term metro is a shortened reference to a metropolitan area. Chicago's commuter rail system that serves the entire metropolitan area is called Metra, while its rapid transit system that serves the city is called the "L" . Rapid transit systems such as the Washington Metro, Los Angeles Metro Rail, the Miami Metrorail, and the Montreal Metro are generally called the Metro.[18]

Other Languages
Afrikaans: Moltrein
arpetan: Metrô
asturianu: Metro
azərbaycanca: Metro
Bân-lâm-gú: Tē-hā-thih
беларуская: Метрапалітэн
беларуская (тарашкевіца)‎: Мэтрапалітэн
български: Метро
brezhoneg: Metro
català: Metro
Чӑвашла: Метрополитен
čeština: Metro
Deutsch: U-Bahn
eesti: Metroo
Ελληνικά: Μετρό
Esperanto: Metroo
فارسی: مترو
français: Métro
한국어: 지하철
հայերեն: Մետրոպոլիտեն
हिन्दी: भूमिगत रेल
Bahasa Indonesia: Angkutan cepat
íslenska: Snarlest
italiano: Metropolitana
қазақша: Метро
kurdî: B-Ban
Кыргызча: Метро
Ladino: Metro
latviešu: Metro
Lëtzebuergesch: Metro
lietuvių: Metropolitenas
Limburgs: Oondergróndse
lumbaart: Metropolitana
magyar: Metró
Bahasa Melayu: Transit aliran
Mìng-dĕ̤ng-ngṳ̄: Dê-tiék
монгол: Метро
မြန်မာဘာသာ: မြေအောက်မီးရထား
日本語: 地下鉄
norsk: Tunnelbane
norsk nynorsk: Tunnelbane
occitan: Mètro
олык марий: Метрополитен
oʻzbekcha/ўзбекча: Metropoliten
پښتو: ميترو
polski: Metro
português: Metropolitano
Qaraqalpaqsha: Metro
română: Metrou
русиньскый: Метро
русский: Метрополитен
саха тыла: Метро
sicilianu: Metropulitana
Simple English: Rapid transit
slovenščina: Podzemna železnica
словѣньскъ / ⰔⰎⰑⰂⰡⰐⰠⰔⰍⰟ: Мєтрополїтєнъ
српски / srpski: Метро
srpskohrvatski / српскохрватски: Metro
suomi: Metro
svenska: Tunnelbana
татарча/tatarça: Метрополитен
тоҷикӣ: Метро
Türkçe: Metro
українська: Метрополітен
Tiếng Việt: Tàu điện ngầm
吴语: 地铁
粵語: 地下鐵
Zazaki: Metro
中文: 地鐵