This refers to a type of public transportation system that operates on tracks at street level or in dedicated lanes, often found in urban areas.

This meaning encompasses different forms of transportation systems that serve to move people within a city, including underground subways, street-level rail, and elevated trains.

A streetcar is a type of rail vehicle that runs on tracks laid within city streets, often sharing the road with other vehicles.

This refers specifically to an underground rapid transit system, which is common in large cities for quick and efficient transportation.

This is an abbreviation commonly used for light rail and may refer to a specific type of lighter and often faster transportation option compared to heavy rail systems.