What is the purpose of the expansion joint?

A rail fish plate is a mechanical continuity component that transforms discrete rail lengths into a structurally cooperative track system by transferring stresses across bolted joints, ensuring operational safety in jointed rail lines. GNEE RAILWAY RAILWAY manufactures fish plates for GB light rail and heavy rail, UIC50–UIC60, DIN536 A-series crane rails, QU crane rails, JIS standards, AS1085 sections, BS11 rails, and AREMA/ASCE profiles, offering coordinated supply for international railway projects.

What is the purpose of the expansion joint?

A rail expansion joint (REJ) is a structural component designed to allow longitudinal movement in railway tracks, preventing buckling, deformation, or breakage caused by thermal expansion/contraction and traffic loads. They are critical for safety, enabling rails to expand safely in heat and contract in cold, especially on bridges and continuous welded rail sections.

Key Purposes and Functions:

• Preventing Buckling: By providing space for expansion, they prevent excessive compressive forces that cause track misalignment and derailment, particularly on long bridges.

• Accommodating Movement: They allow the rail to move safely during temperature fluctuations, protecting against both thermal stress and stress from structural movement.

• Ensuring Structural Integrity: They prevent damage to track components like sleepers, fasteners, and switch machines.

• Transitioning Structures: They are used at transitions, such as from an embankment to a bridge, where the bridge deck and ground move differently.

How are rail joints manufactured?

Rail joints are manufactured by hot-rolling high-quality steel, followed by precise cutting, punching bolt holes, and sometimes heat-treating for hardness. They are designed to connect rail ends securely, with specialized types like insulated joints using polyurethane or epoxy-glass fiber for insulation, and compromise joints forged to fit different rail profiles.

• Material Selection and Hot Rolling: High-quality steel is heated and rolled through multiple passes to form the necessary shape, ensuring proper tensile strength and hardness.

• Cutting and Punching: The rolled steel is accurately cut to specific lengths and punched with holes to accommodate bolts for securing the rails.

• Heat Treatment: For enhanced durability and wear resistance, rail joints may undergo quenching and tempering processes.

• Insulation (for Insulated Joints): Non-bonded insulated joints utilize durable, UV-resistant polyurethane bonded to the joint bar sections.

• Alternatively, specialized Epoxy-glass fiber insulation is used to ensure high electrical resistance and structural integrity.

• Finishing and Inspection: The finished joints are inspected for dimensional accuracy and quality to meet international standards.

• Marking: Joints are often marked with details such as the manufacturer code, month, and year of production for traceability.

Founded in 2008, GNEE RAILWAY RAILWAY is a leading global manufacturer and supplier of railway components, specializing in high-quality rail fish plates (joint bars/splice bars) with strong production capacity and global service capabilities.

Our rail fish plate portfolio is comprehensive and compliant with international standards including UIC, AREMA, BS, DIN, and GB, covering light rail (8kg-30kg), heavy rail (38kg-75kg), and crane rail (QU70-QU120) systems. We offer diverse types such as insulated joint bars, bulged fish plates, and compromise rail joints,with precise specifications (4-hole/6-hole, 24-inch/36-inch), ensuring excellent mechanical performance.We uphold strict quality control supported by ISO 9001:2015 certification, an in-house inspection center, and third-party audits by SGS and BV. Our one-stop service includes customization, production, packaging, and after-sales support, tailored to clients' project needs.

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