Pre-series set S201 and S101 on a test run in July 2015
|In service||Spring 2016 (scheduled)|
|Number built||12 vehicles|
|Formation||9+3 cars per trainset|
|Fleet numbers||S101–, S202–|
|Capacity||686 (656 standard + 30 Green)|
|Car body construction||Aluminium alloy|
|Car length||20,000 mm (65 ft 7 in)|
|Width||2,920 mm (9 ft 7 in)|
|Height||3,540 mm (11 ft 7 in)|
|Floor height||1,130 mm (3 ft 8 in)|
|Doors||One per side|
|Maximum speed||130 km/h (80 mph)|
|Electric system(s)||1,500 V DC|
|Current collection method||PS39 single-arm pantographs|
|Bogies||DT81, DT82 (motored), TR265 (trailer)|
|Safety system(s)||ATS-P, ATS-PS|
|Track gauge||1,067 mm (3 ft 6 in)|
The E353 series (E353系?) is a DC tilting electric multiple unit (EMU) train on order by East Japan Railway Company (JR East) in Japan for use on limited express services on the Chuo Main Line from spring 2016.
A pre-series train, consisting of one 9-car set and one 3-car set, was delivered in July 2015 for performance testing. The trains will ultimately replace the E351 series EMUs used on Super Azusa limited express services on the Chuo Main Line between Shinjuku in Tokyo and Matsumoto in Nagano Prefecture.
The exterior styling was overseen by the industrial design firm Ken Okuyama Design. Like the E351 series trains which they are scheduled to replace, the new E353 series trains incorporate tilting technology to allow faster speeds around curves. The trains use a pneumatic tilt system (instead of the pendulum system used in the older trains) and an active suspension to reduce tilt times and help reduce motion sickness in passengers. The train features a database of curves along the line, allowing the train to begin tilting before reaching the curve. There are also dampers installed between the cars to reduce vibrations.  Maximum operating speed will be 130 km/h (80 mph). To reduce any step up from station platforms, the train floor height is 1,130 mm (3 ft 8 in), 10 mm lower than on E259 series and E657 series trains.
The trains use bolsterless bogies developed from those used on earlier E259 series and E657 series trains. Motored bogies with capability for retrofitting anti-oscillation equipment (rear bogies on car 1 and 3) are designated DT81, motored bogies equipped anti-roll devices (cars 2, 5, 7, and 10) are designated DT82, and motor bogies not equipped with either (cars 6 and 11) are designated DT81A. Non-powered (trailer) bogies are designated TR265, and are equipped with a parking brake and capability for retrofitting anti-oscillation equipment, but those not equipped with a parking brake (rear bogies on cars 4 and 14, and both bogies on car 9) are designated TR265A, and those on car 8, which not equipped with either are designated TR265B.
Trains consist of a nine-car main set (with five cars motored), numbered S101 onward, and a three-car add-on set, numbered S201 onward, with car 1 at the southern (Shinjuku) end.
|Numbering||KuMoHa E353||MoHa E353-1000||KuMoHa E352||KuHa E353||MoHa E353-500||MoHa E352-500||MoHa E353-2000||SaHa E353||SaRo E353||MoHa E353||MoHa E352||KuHa E352|
Green car (first class) accommodation is in 2+2 abreast configuration with a seat pitch of 1,160 mm (46 in). The wine red seat covers are intended to create subdued atmosphere. Standard class is also arranged 2+2 with a seat pitch of 960 mm (38 in), compared to 970 mm (38 in) for Super Azusa E351 series trains. The pale blue seat covers are intended to evoke images of the Azusa River, after which the train service was named. AC power outlets are provided at each seat. The trains include universal access toilets and security cameras. LED lighting is used on these trains, for the first time on JR East limited express rolling stock.
Inside, the floors feature rubber coverings to reduce the noise of footsteps. Individual seat numbers are written in braille and every seat features an individual air diffuser for passenger comfort. The cars also feature air purifiers using ozone to reduce unpleasant odors. 
Cars 1, 2, 4, 6, 8, 9, and 11 have toilet facilities as follows.
|Car No.||Urinal||Western-style WC||Universal-access WC||Washroom|
Details of the new trains on order were first officially announced by JR East in February 2014.
The first trainset, consisting of one 9-car and one 3-car set, was delivered from the Japan Transport Engineering Company (J-TREC) factory in Yokohama to Matsumoto Depot in July 2015. Mainline test running started on 29 July 2015. The pre-series train was formally shown off to the media on 2 August 2015.
- Saito, Masatoshi (4 February 2014). 中央線特急:「スーパーあずさ」後継に「Ｅ３５３系」 [E353 series - the successor for Chuo Line "Super Azusa" limited express services]. Mainichi Shimbun (in Japanese). Japan: The Mainichi Newspapers. Retrieved 4 February 2014.
- "中央線新型特急電車（E353系）量産先行車新造について" [Details of new pre-series E353 series limited express trains for Chuo Line]. Tetsudo Hobidas (in Japanese). Japan: Neko Publishing. 4 February 2014. Retrieved 4 February 2014.
- "中央線新型特急「E353系」量産先行車新造へ－2015年夏以降に完成" [Pre-series E353 series limited express to be built for Chuo Line]. Hachioji Keizai Shimbun (in Japanese). Japan: Factory ZIAS G.K. 4 February 2014. Retrieved 4 February 2014.
- Japan Railway Journal- New Generation Express: Journey to Speed and Comfortability. NHK. 2016. Event occurs at 6:30. Retrieved June 21, 2016.
- Ishida, Toshiyuki (December 2015). E353系特急形直流電車 [E353 series limited express DC EMU]. Japan Railfan Magazine (in Japanese). Vol. 55 no. 656 (Japan: Koyusha Co., Ltd.). pp. 46–53.
- Kondo, Takashi (2 August 2015). スーパーあずさ：デザインもフェラーリ風？ 新型電車公開 [New Super Azusa unveiled - Design also Ferrari-style?]. Mainichi Shimbun (in Japanese). Japan: The Mainichi Newspapers. Retrieved 2 August 2015.
- E353系量産先行車 [E353 series pre-series train]. Japan Railfan Magazine (in Japanese). Vol. 55 no. 654 (Japan: Koyusha Co., Ltd.). October 2015. pp. 10–17.
- 甲種鉄道車両輸送計画表 [Rolling stock delivery schedules]. Tetsudō Daiya Jōhō Magazine (in Japanese). Vol. 44 no. 376 (Japan: Kotsu Shimbun). August 2015. p. 128.
- E353系の試運転が始まる [E353 series test running starts]. Japan Railfan Magazine Online (in Japanese). Japan: Koyusha Co., Ltd. 30 July 2015. Retrieved 30 July 2015.
- E353系付属編成が大糸線で試運転 [E353 series add-on set test run on the Oito Line]. Japan Railfan Magazine Online (in Japanese). Japan: Koyusha Co., Ltd. 15 July 2016. Archived from the original on 16 July 2016. Retrieved 16 July 2016.
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