Battling the Snow: Japan's Northern Railways - Japan Railway Journal

Key Concepts

• Snow Countermeasures: Integrated systems of mechanical, automated, and manual snow removal.
• ENR1000: A high-performance, 1,000-horsepower snow-clearing vehicle.
• Sasara Street Cars: Traditional rotary broom vehicles using bamboo brushes for snow removal.
• Operational Control Center (OCC): The hub for real-time monitoring and decision-making regarding service suspensions and snow removal deployment.
• Infrastructure Protection: Techniques to prevent structural damage to stations and overhead equipment (e.g., icicle removal).

1. Railway Snow Management in Niigata Prefecture

Niigata Prefecture, located along the Sea of Japan, experiences some of the heaviest snowfall in Japan. JR East’s Niigata branch manages 13 lines, utilizing a combination of high-tech automation and manual labor to maintain operations during the four-month winter season.

• Shinkansen Infrastructure: The Joetsu Shinkansen utilizes an automated sprinkler system along 75 km of track. The system detects snowfall and sprays 10°C warm water to melt snow before accumulation. A closed-loop pump system circulates the water, contributing to a 40-year record of no major snow-related delays.
• Conventional Line Challenges: Unlike the Shinkansen, conventional lines in mountainous areas face frequent disruptions. Following a 2018 incident where 430 passengers were stranded for over 12 hours, JR East significantly bolstered its response protocols.

2. The ENR1000 Snow Clearing Vehicle

The ENR1000 is the backbone of JR East’s mechanical snow removal.

• Specifications: 25 meters long, 1,000-horsepower engine.
• Capacity: Clears the equivalent of 1,510-ton containers of snow per hour; throws snow up to 15 meters away.
• Functionality: Features dual-mode heads (plow and blower) that can switch in one minute.
• Automation: Equipped with an onboard system that uses real-time track position data to automatically retract wings before entering tunnels or level crossings, ensuring safety even in low-visibility conditions.

3. Manual Removal and Maintenance Framework

When machines cannot reach specific areas, manual labor is required:

• Station Roofs: Once snow reaches 1.5 meters, teams of 30–50 workers remove snow to prevent structural collapse and hazards to people below.
• Tunnel Maintenance: Workers use 5-meter insulated poles with wooden hammers to knock down icicles that could damage train windows or pantographs.
• Patrols: Staff monitor overhead wires and level crossings to ensure barriers function correctly and road surfaces remain clear for public safety.

4. Operational Control and Decision-Making

The Niigata branch operates a 24-hour control center.

• Monitoring: Staff utilize video feeds from 59 cameras at unmanned stations and real-time weather data.
• Planning: Daily meetings at 8:00 a.m. determine the deployment of snow plows based on weather forecasts.
• Safety Protocols: During severe cold waves, services are suspended in advance to allow for thorough snow clearing, prioritizing safety over continuous operation.

5. Case Study: Sapporo’s Sasara Street Cars

In Sapporo, the northernmost major city, street cars utilize a unique, traditional method for snow removal.

• The Sasara Method: Invented in 1925, these vehicles use rotary bamboo brushes ("Sasara") to sweep snow.
• Why Bamboo: Bamboo is highly flexible, allowing it to clear snow effectively without damaging asphalt or rails.
• Maintenance: Each vehicle requires 16 brushes, which are replaced 2–3 times per winter. Crews prepare 150–200 brushes annually.
• Operational Routine: Sasara cars operate before dawn (starting at 4:00 a.m.) to clear tracks before the first passenger service, ensuring the 8.9 km loop remains operational throughout the winter.

Synthesis and Conclusion

The management of heavy snowfall in Japanese railways is a sophisticated blend of 40-year-old proven technology (Shinkansen sprinklers), modern heavy machinery (ENR1000), and traditional, highly effective manual techniques (Sasara brushes). The core takeaway is that while automation and high-powered equipment provide the foundation for safety, the system relies heavily on the dedication and real-time decision-making of human staff. Whether it is the 24-hour monitoring at the control center or the manual removal of icicles in tunnels, the integration of these diverse methods ensures that even in extreme weather, the railway network remains a reliable lifeline.