Ayase Station(綾瀬駅,Ayase-eki?) is a JR East and Tokyo Metro station located in Adachi, Tokyo, Japan. It is operated by Tokyo Metro and is one of the busiest stations in the Tokyo Metro network, with an average of 435,540 passengers per day in fiscal year 2012 (including passengers using through service to the Joban Line).
Ayase is currently the northern terminus of most Chiyoda Line services that do not continue to the Joban Line, as Kita-Ayase Station cannot accommodate trains longer than three cars. Tokyo Metro plans to expand Kita-Ayase Station to accommodate ten-car trains for through service to the Chiyoda Line beyond Ayase.
The official boundary between the Joban Line and Chiyoda Line is located east of Ayase Station, past the turnoff for the Kita-Ayase branch of the Chiyoda Line. However, the segment of the Chiyoda Line between Ayase and Kita-Senju Station is treated as part of the Joban Line for fare calculation purposes when passengers do not travel on Tokyo Metro beyond Kita-Senju.
Ayase Station also serves as a turnaround point for the Odakyu 60000 series MSERomancecar service through the Chiyoda Line, and is sometimes used as a delivery point for Tokyo Metro trainsets by rail; JR Freight transports the trainsets to Ayase during midnight hours, where Tokyo Metro takes delivery and hauls them to the nearby Ayase depot.
April 1, 1943: This station opened as a station of JGR (later JNR) Jōban Line.
April 20, 1971: Chiyoda Line of Teito Rapid Transit Authority (TRTA) started operation and replaced Jōban Line local service between Kita-Senju and Ayase. TRTA assumed management of the station from JNR.
December 20, 1979: Kita-Ayase Branch Line began service.
April 1, 2004: TRTA was privatized as Tokyo Metro.