# DeRoI-class locomotive

> class of 9 electric locomotives built by Toshiba

**Wikidata**: [Q23020776](https://www.wikidata.org/wiki/Q23020776)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/DeRoI-class_locomotive_(Toshiba))  
**Source**: https://4ort.xyz/entity/deroi-class-locomotive

## Summary
The DeRoI-class locomotive is a class of 9 electric locomotives built by Toshiba between 1943 and 1944 for the Chōsen Government Railway. Designed for operation under 3000 V DC electrification, these locomotives featured a 1Co+Co1 wheel arrangement and standard-gauge compatibility, reflecting Japan's pre-World War II industrial capabilities and railway infrastructure investments in Korea.

## Key Facts
- **Manufacturer**: Toshiba (1943–1944).
- **Total Produced**: 9 units.
- **Operator**: Chōsen Government Railway (during Japanese colonial rule in Korea).
- **Wheel Arrangement**: 1Co+Co1 (articulated design for stability).
- **Electrification**: 3000 V DC railway electrification.
- **Track Gauge**: Standard-gauge railway (1,435 mm).
- **Official Names**: デロイ (Japanese), 전기하 (Korean).
- **Class**: Electric locomotive subclass.

## FAQs
### Q: Who built the DeRoI-class locomotives?
A: The DeRoI-class locomotives were manufactured by Toshiba, a Japanese conglomerate, between 1943 and 1944.

### Q: Where were these locomotives primarily used?
A: They were operated by the Chōsen Government Railway in Korea, which was under Japanese colonial rule at the time.

### Q: What type of electrification did they use?
A: The locomotives were designed for 3000 V DC railway electrification, a system used in mountainous or heavy freight routes.

## Why It Matters
The DeRoI-class locomotives represent a convergence of Japan's pre-World War II industrial expansion and colonial infrastructure projects. Built by Toshiba, a leader in electrical engineering, these locomotives were tailored for Korea's challenging mountainous terrain and heavy freight demands under Japanese rule. Their 1Co+Co1 wheel arrangement and 3000 V DC electrification underscored advanced railway technology of the era, designed to bolster logistical capabilities in a strategically critical region. Though produced in limited numbers (9 units), they symbolize the intersection of corporate innovation, geopolitical strategy, and industrial modernization during a tumultuous period in East Asian history.

## Notable For
- **Wartime Production**: Built during World War II (1943–1944) amid Japan's military and industrial mobilization.
- **Articulated Design**: The 1Co+Co1 wheel arrangement provided exceptional stability for mountainous routes.
- **Colonial Infrastructure**: Played a role in Japan's efforts to modernize Korean railways for resource extraction and military logistics.
- **Technical Specifications**: Utilized 3000 V DC electrification, a high-voltage system for demanding operations.

## Body
### Development and Production
The DeRoI-class locomotives were designed and manufactured by Toshiba, a Japanese conglomerate with expertise in electrical engineering, between 1943 and 1944. This period coincided with Japan's wartime industrial surge and its colonial administration in Korea. The production of 9 units reflected specialized needs rather than mass production.

### Technical Specifications
- **Wheel Arrangement**: 1Co+Co1 (articulated bogies for improved traction and stability).
- **Electrification**: Operated under 3000 V DC overhead lines, suitable for heavy-duty freight and steep gradients.
- **Track Gauge**: Standard-gauge (1,435 mm) compatibility ensured integration with Japan's railway network.

### Operational History
The locomotives were deployed by the Chōsen Government Railway, the state-run railway system in Korea under Japanese colonial rule (1910–1945). Their design addressed the challenges of Korea's mountainous geography, supporting freight transport critical to Japan's wartime economy. The use of 3000 V DC electrification aligned with contemporary Japanese railway modernization efforts.

### Legacy
The DeRoI-class locomotives exemplify Japan's strategic investment in colonial infrastructure and Toshiba's engineering prowess. While their post-war fate remains undocumented, their existence highlights the complex interplay of technology, colonialism, and military logistics in early 20th-century East Asia. As a small but specialized class, they remain a footnote in the broader history of railway electrification and Japan's industrial ambitions.