A medium-capacity system (MCS), also known as light rapid transit or light metro, is a rail transport system with a capacity greater than light rail, but less than typical heavy-rail rapid transit. https://en.wikipedia.org/wiki/Medium-capacity_rail_system
https://en.wikipedia.org/wiki/Medium-capacity_rail_system#Advantages_and_disadvantages
https://en.wikipedia.org/wiki/Urban_rail_transit#Rapid_transit
https://en.wikipedia.org/wiki/Urban_rail_transit#Urban_rail_transit_types
