The 115 series (115系, 115-kei) is a DC electric multiple unit (EMU) train type developed by Japanese National Railways (JNR) and now operated by East Japan Railway Company (JR East), West Japan Railway Company (JR-West), and the Shinano Railway.
Currently used on the Agatsuma Line, Ryōmō Line, Chūō Main Line (East Line), Hakushin Line, Jōetsu Line, Ōito Line,Shinetsu Main Line, Shinonoi Line, Yahiko Line, and the Echigo Line. 115 series trains were also previously used on the Shōnan-Shinjuku Line, Takasaki Line, and Utsunomiya Line.
Currently used on the Hakubi Line, Maizuru Line, Sagano Line, Sanin Main Line and the Sanyō Main Line
Formerly used on the Minobu Line, Gotemba Line and the Tōkaidō Main Line. Sets owned by JR East currently operate on the JR Central Iida Line and Chūō Main Line (West Line).
Used on the Shinano Railway Line.
This is a cold-weather version of the earlier 113 series. The first examples were introduced from 1963 on the Takasaki Line out of Ueno.
Air-conditioned version introduced from 1973.
Introduced from 1978 with increased seat pitch and improved cold-weather performance.
Hiroshima,Shimonoseki and Shizuoka area version introduced in 1978. Specifications based on 115-1000 series.
Two-door version introduced from November 1982 to replace 153 series EMUs on "Rapid" services in the Shimonoseki area.
Former 117 series MoHa 117 and MoHa 116 two-door cars converted from May 1992 for use in the Okayama and Hiroshima areas.
JR-West 2-car sets converted in 1999 by building new cabs at one end of former MoHa (non-driving motor) cars.
In January 2017, Niigata-based set N3 was repainted into the original "Niigata Livery" of red and yellow formerly carried by JNR 70 series EMU trains.