Braking beyond wheel adhesion
Roof panels add aerodynamic drag, while an experimental linear device brings coils close to the rail to produce electromagnetic retardation. Both were investigated for faster emergency stopping.
Shinkansen
E956 · ALFA-X
Look closer
What stands out in the nose profile?
先頭形状
Experimental train. The two ends have different noses.
Compare · E5 · Tōhoku · Hokkaidō
JR東日本 · ALFA-XのデザインExperimental train. The two ends have different noses.
Engineering details
E956 ALFA-X · test specification, 2020
| Formation | 10 motor cars · 10M |
|---|---|
| Power supply | 25 kV AC · 50 Hz only |
| Traction control | VVVF inverter |
| Brakes | Regenerative + electrically commanded air braking |
| Body control | 2° air-spring tilt; full-active control throughout |
| Design temperature range | −30°C to +40°C design specification |
| Test speed capability | Approximately 400 km/h test capability |
Technical sources · 2026-11-07
- JR EAST Technical Review No.65 · JR東日本 · 2020 · 冊子9頁・ALFA-X主要諸元
Inside the engineering
E956 experimental platform · JR East 2019/2020 development account
| Powered formation | 10 cars · all powered |
|---|---|
| Test capability / research target | About 400 km/h test capability; research for 360 km/h service |
| Cold design condition | −30 °C |
| Traction switching | SiC devices for efficient, compact high-output equipment |
| Maximum experimental tilt | 2° |
| Condition monitoring | Vibration and temperature sensors on bogie frames and axleboxes |
Snow control through heat and airflow
Heated underfloor panels and reshaped areas around the bogies address snow adhesion and snow-laden airflow. These are experimental provisions described in the 2020 review.
Technical sources and page references
- 次世代新幹線の実現を目指して ～新幹線試験プラットフォームALFA-X～
JR EAST Technical Review No.65 · 2020 · pp.5–15; particularly pp.10–13 - 新幹線の試験車両ALFA-Xのデザインおよび開発状況について
JR東日本 · 2018-10-03 · 開発状況 / さらなる安全性・安定性の追求
Two ends, two experiments
Original side-profile schematics. Both noses face left for comparison. The 16:22 length ratio is shared; curves and vertical proportions are simplified.
Car 1 keeps an E5-like amount of interior space. Car 10 has a much longer nose, a raised cab and a flatter upper nose profile. JR East compares the shapes to reduce the pressure wave produced when entering a tunnel.
JR東日本 · ALFA-X 編成デザイン · 2019-03-15 · トラベル Watch · 10号車側面・運転台 · 2019-02-10 · 鉄道ファン · 10号車の構体 · 2019-02-08 · 2026-11-07Inside the train
On ALFA-X the windows are part of the experiment. JR East designed cars with different window sizes, including a windowless section, to study the car structure and cabin environment. Instruments travel throughout the formation.
JR東日本 · 新幹線の試験車両ALFA-X · 別紙「編成デザイン」 ·Year introduced · 2019 試験 / trials
Sources and updates
Checked 2026-11-07