Light rail transit is a form of passenger urban rail transit that operates electric-powered single cars or short trains on fixed rails. It is characterized by a combination of tram and rapid transit features, and while its rolling stock is similar to a traditional tram, it operates at a higher capacity and speed. Light rail operates primarily along exclusive rights-of-way and uses either individual tramcars or multiple units coupled to form a train that is lower capacity and lower speed than a long heavy-rail passenger train or rapid transit system. Light rail is similar to the British English term light railway, which distinguishes railway operations carried out under a less rigorous set of regulations using lighter equipment at lower speeds from mainline railways. Light rail is comfortable, fast, quiet, and safe, and it offers more flexibility in station locations and routes than other rail systems. Light rail vehicles (LRVs) are distinguished from rapid rail transit (RRT) vehicles by their capability for operation in mixed traffic, generally resulting in a narrower car body and articulation in order to operate in a traffic street environment.