Original: Light rail or light rail transit (LRT) is a form of urban rail public transportation that generally has a lower capacity and lower speed than heavy rail and metro systems, but higher capacity and higher speed than street-running tram systems.
Simplified: Light rail or light rail transit (LRT) is a form of urban rail public transportation. Generally it can carry less people and has a lower speed than heavy rail and metro systems, but it can carry more people and has a higher speed than street-running tram systems.