When regeneration has nowhere to go
A braking chopper diverts unaccepted regenerative energy to resistors, sustaining electric braking almost to standstill.
Regional railways
E129 · Niigata · 新潟
Niigata’s E129 succeeded the 115 series. Its design draws on E233 technology, with wider seats and updated passenger information displays.
JR東日本
Technical details
| Power supplyE129 | DC |
|---|---|
| Published maximum speedE129 | 110 km/h |
| TechnologyE129 | Based on E233 technology |
M = motor car; T = trailer. Each row applies to the stated version and source date.
Technical sources
- E129系 · JR東日本 · — · 基本情報・車両紹介
Inside the engineering
2015 manufacturer specification, not the earlier 2013 planning table.
| Speed categories | Service 110 km/h; design 120 km/h. |
|---|---|
| Motor rating | MT75B induction motor: 140 kW one-hour rating per motor. |
| Distributed traction | Each car has one powered and one unpowered bogie (0.5M). |
| Converter grouping | SC102: two-level IGBT, two independent two-motor groups. |
| Degraded restart | A two-car set can restart on 35‰ with one two-motor group isolated. |
| Drive gearing | TD parallel cardan; 97:16 gear ratio (about 6.06). |
Technical sources and page references
- 東日本旅客鉄道株式会社E129系一般形直流電車用電機品
東洋電機製造・東洋電機技報131 · 2015-04 · pp.27–31（国立国会図書館保存）
Seating
- E129 · 新潟
- Bench and transverse seating
In the photographed leading car, benches occupy the space between the cab-end and middle doors. Walk past the middle doors toward the coupling to find the mixed seating area.
Year introduced · 2014
Sources and updates
Checked 2026-11-07