ADJ [ADJ n]（城市）高速（轨道）交通（网络） A rapid transit system is a transport system in a city which allows people to travel quickly, using trains that run underground or above the streets. （城市）高速（轨道）交通（网络）
...a rapid transit link with the City and London's underground system.
和伦敦城及伦敦地铁网连接的高速交通网
Two rapid transit trains collided early this morning in Boston.