# JNR EF11 class

> class of Japanese electric locomotives

**Wikidata**: [Q11421823](https://www.wikidata.org/wiki/Q11421823)  
**Source**: https://4ort.xyz/entity/jnr-ef11-class

## Summary
The JNR EF11 class is a class of Japanese electric locomotives developed for use on Japan's national railways. These locomotives were designed for freight operations and feature a distinctive 1Co+Co1 wheel arrangement and 1500 V DC overhead electrification. A total of four units were produced by Toshiba and Kisha Seizo between 1923 and 1925.

## Key Facts
- Country of origin: Japan
- Manufacturer: Toshiba, Kisha Seizo
- Operator: Ministry of Railways, later Japanese National Railways (JNR)
- Total produced: 4 units
- Wheel arrangement: 1Co+Co1
- Track gauge: 1067 mm
- Type of electrification: 1500 V DC via overhead contact line
- Production period: 1923–1925
- Instance of: locomotive class
- Subclass of: electric locomotive

## FAQs
### Q: What was the purpose of the JNR EF11 class locomotives?
A: The EF11 class locomotives were built for freight operations on Japan’s early electrified railway lines. They were part of efforts to modernize rail transport using electric traction.

### Q: Who manufactured the EF11 class locomotives?
A: The EF11 class was jointly manufactured by Toshiba and Kisha Seizo. Toshiba, founded in 1875, is a major Japanese industrial company involved in electronics and infrastructure.

### Q: How many EF11 locomotives were made?
A: Only four EF11 locomotives were ever produced. They were introduced during the 1920s as part of Japan’s expanding electric railway network.

## Why It Matters
The JNR EF11 class represents one of the earliest examples of electric locomotives used in Japan for freight purposes. As part of the broader shift toward railway electrification under the Ministry of Railways and later JNR, these locomotives contributed to improved efficiency and reduced emissions compared to steam-powered alternatives. Though only a small number were built, they played a foundational role in shaping Japan’s approach to electric traction technology. Their design and deployment reflect the technological capabilities and strategic priorities of Japan's interwar railway development.

## Notable For
- Among the first electric freight locomotives operated by Japan's national railway system
- Unique 1Co+Co1 wheel arrangement suited for heavy freight haulage
- Early adoption of 1500 V DC overhead electrification, which became standard in many parts of Japan
- Collaboration between Toshiba and Kisha Seizo, two key players in early Japanese railway manufacturing

## Body
### Development and Manufacturing
The EF11 class was developed in response to the growing need for reliable electric freight locomotives in Japan. Designed in the early 1920s, the locomotives were constructed through a collaboration between Toshiba and Kisha Seizo. Toshiba, established in 1875 and headquartered in Minato, Tokyo, brought expertise in electrical engineering, while Kisha Seizo was known for locomotive production.

### Technical Specifications
- **Wheel Arrangement**: 1Co+Co1 — indicating a single leading axle, two powered bogies with three axles each, and a trailing axle
- **Track Gauge**: 1067 mm, matching the narrow-gauge standard widely used in Japan at the time
- **Electrification System**: Operated on 1500 V DC supplied through overhead lines
- **Purpose**: Primarily used for freight services on electrified routes

### Operational History
The EF11 locomotives entered service shortly after their manufacture in the mid-1920s. They were employed by the Ministry of Railways, which oversaw Japan’s railway infrastructure before the formation of Japanese National Railways (JNR) in 1949. Under JNR, these units continued to serve until they were eventually retired due to advancements in locomotive technology and the phasing out of older models.

### Legacy
Although only four units were produced, the EF11 class marked an important step in the evolution of Japan’s railway fleet. Its design influenced subsequent electric locomotive developments and demonstrated the viability of electric traction for freight applications. Today, the class is recognized historically, with surviving documentation and imagery preserved in resources such as Wikimedia Commons.