Project Profile: Zafra-Huelva Railway Line Modernization

The 180km standard gauge Zafra-Huelva railway line in Spain is undergoing a comprehensive €210 million modernization to overhaul its infrastructure and superstructure. The project focuses on enhancing safety, increasing operational capacity, and reducing journey times to improve regional connectivity and stimulate economic development.

Technical Specifications

Infrastructure and Superstructure Renewal

The project involves a complete track renewal across five sections, replacing existing components with modern, high-performance materials. Key specifications include:

• Rail: 60kg rail for increased durability and load capacity.
• Sleepers: High-strength concrete sleepers.
• Structural Works: Comprehensive reinforcement of bridges and tunnels, along with slope stabilization in cuttings and embankments to ensure long-term track integrity.
• Drainage Systems: Substantial improvements to address water accumulation and prevent track degradation.
• Station Works: Replacement of track switches in multiple stations to improve operational efficiency.

Signaling, Control, and Telecommunications

A core component of the modernization is the complete overhaul of the line’s control and communication systems. The outdated telephone block system is being replaced with advanced technologies:

• Signaling System: A new Automatic Release Block (BLAU) system with electronic interlocks, controlled from a Centralized Traffic Control (CTC) center in Seville.
• Train Protection: Installation of new LED signals equipped with Automatic Signal Announcement and Braking (ASFA) digital beacons.
• Train Detection: Deployment of modern axle counters for precise train location tracking.
• Communications: Implementation of the Global System for Mobile Communications – Railway (GSM-R) for robust train-to-control-center communication. A new fiber-optic cable network is being installed along the entire route to support data transmission.
• Power Supply: Enhancement of the uninterruptible power supply (UPS) systems to ensure high reliability for all signaling and telecommunications equipment.

Key Takeaways

• Enhanced Safety and Efficiency: The upgrade to a BLAU system with CTC, electronic interlocks, and ASFA digital beacons significantly enhances operational safety and eliminates inefficiencies associated with the legacy telephone block system.
• Increased Capacity and Reduced Journey Times: Comprehensive track renewal and structural reinforcement allow for the removal of speed restrictions, increasing the line’s capacity and significantly reducing travel times for both passenger and freight services.
• Improved Regional Connectivity: By modernizing the link between Zafra, Huelva, and key towns like Jabugo and Calanas, the project serves as a catalyst for economic development and provides a more reliable transport option for the region.

Frequently Asked Questions (FAQ)

What is the primary goal of the Zafra-Huelva line renovation?
The main objective is a comprehensive modernization to increase operational capacity, reduce journey times by eliminating speed restrictions, and improve the overall safety, reliability, and resilience of the railway for both passenger and freight transport.

What are the key technological upgrades being implemented in the signaling system?
The project involves replacing the outdated telephone block system with a modern Automatic Release Block (BLAU) system managed by a Centralized Traffic Control (CTC) center. It also includes the installation of the GSM-R communication system, ASFA digital beacons for train protection, and a new fiber-optic network for reliable data communication.