What is "keikyu"

, also known as or, more recently, , is a private railroad that connects inner Tokyo to Kawasaki, Yokohama, Yokosuka and other points on the Miura Peninsula in Kanagawa Prefecture. It also provides rail access to Haneda Airport in Tokyo. means the - area. The company's railway origins date back to 1898, but the current company dates to 1948. The Kantō region's first electric train (the nation's third, after Kyoto Electric Railway and Nagoya Electric Railway) rolled in January 1899.

It is part of the Fuyo Group and has its headquarters in Minato, Tokyo. The company changed its English name from Keihin Electric Express Railway Co., Ltd. to Keikyu Corporation on 21 October 2010.

Trains on the Main Line have a maximum operating speed of , making it the third fastest private railroad in the Tokyo region, after the Keisei Skyliner and the Tsukuba Express. The track gauge is ( Standard gauge), differing from the more common Japanese track gauge of .