捷運系統是於都會區主要運輸走廊，以特別設計的電聯車行駛於專用路權的軌道上，可採用地下、地面及高架三種方式來建造。由於在專用的路軌上行駛，沒有紅綠燈，行駛途中不會受任何交通干擾，因此可以暢通無阻，再加上自動或半自動化行車控制系統，可提供班次密集、運量大、速度快、準時、安全又舒適的服務。
輕軌系統包括輕軌捷運系統（Light Rail Rapid Transit, LRRT）與輕軌運輸系統（Light Rail Transit, LRT），均屬於軌道運輸系統的一種。LRRT有專用路權，行車速率較高，並可完全自動控制，運量較LRT為高。輕軌系統因車身結構簡單、重量輕，且使用每公尺重量37公斤的輕軌而得名，有別於一般鐵路每公尺50公斤以上的重軌。
Light Rail System
Light rail system, including light rail rapid transit system
(Light Rail Rapid Transit, LRRT) and Light Rail Transit (Light Rail Transit,
LRT), belong to a rail transport system. LRRT a dedicated right of way, driving rates
higher, and can be fully automatic control, traffic is higher than the LRT. Light rail system for the body structure
is simple, light weight, and use the weight of 37 kilograms per meter named
light rail, unlike the railway for more than 50 kg per meter of heavy rail.
輕軌電車是都市公共運輸中最富彈性的運輸型式，因車輛內裝設計、列車組成、建造型式、控制系統、路權型式等彈性大，可依地方實質環境與交通需求特性做適切的設計，而且造價比中運量（如木柵線）、高運量（如板南、淡水線）低很多，被歐、美各國公認為一種極具成本效益與空間效用的大眾運輸系統。
Light rail is the most flexible urban public transport in the transport model, due to vehicle interior design, train composition, construction type, control systems, road right type so flexible, and can transport needs of the local physical environment and make appropriate design features,and the cost ratio of traffic (such as the Mucha line), high-traffic (such as Bannan, fresh water line) is much lower by the EU, USA, recognized as a highly cost-effective and space-effective public transport system.
輕軌電車大多為三節車廂，載客量約200人，最高時速每小時70公里，平均時速30公里，單向最高運量每小時達2萬人次，運量雖較「高運量捷運系統」低，但比公車或電車巴士高。
Most of the three light rail cars, carrying about 200 people, a top speed of 70 km per hour, with an average speed of 30 km, the highest one-way traffic up to 20,000 passengers per hour, traffic compared with a "mass rapid transit system" low, but higher than the bus or tram bus.
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