railroad shuttle service
/ˈɹeɪlɹəʊd ˈʃʌtəl ˈsɜːvɪs/
n
English · railroad shuttle service中文 · 机场快线Español · servicio de enlace ferroviarioFrançais · navette ferroviaire
意味：Train that runs frequently between the terminal and the city or the nearest station.