noun
Keihin Airport Line
Proper noun: a railway line operated by Keikyu Corporation connecting central Tokyo to Haneda Airport.
京浜急行空港線で羽田空港まで行きます。
I go to Haneda Airport on the Keihin Airport Line.
Compound of 京浜 (Keihin, referring to the Tokyo-Yokohama area), 急行 (express), 空港 (airport), and 線 (line).