The is an EMU type used for commuter and outer - suburban services operated by East Japan Railway Company ( JR East ) in Japan , and manufactured by Tokyu Car Corporation , Kawasaki Heavy Industries and also at JR East 's factory at Niitsu in Niigata Prefecture .
The is an electric multiple unit type used for commuter and outer - suburban services operated by East Japan Railway Company ( JR East ) in Japan since 2000 . 
 Trains were manufactured by Tokyu Car Corporation , Kawasaki Heavy Industries and also at JR East 's factory at Niitsu in Niigata Prefecture .