How rail joint bar works?

A rail fish plate is a steel jointing bar that mechanically reconnects rail ends so that the joint behaves as part of the continuous track structure rather than a structural discontinuity. GNEE RAILWAY RAILWAYL manufactures fish plates for GB rails, UIC standard rails, JIS rail sections, AS1085 profiles, BS11 standards, AREMA/ASCE rail sizes, and crane rail systems including DIN536 and QU, providing joint compatibility analysis and export logistics.

How rail joint bar works?

A rail joint bar (or fishplate) connects two rail ends using high-strength steel bars bolted to the web (sides) of the rails, ensuring structural continuity, vertical alignment, and proper spacing for thermal expansion. It acts as a bridge, transferring vertical wheel loads between rail ends, and restricting lateral/longitudinal movement to prevent derailments.

Key Components and Working Mechanism:

• Structure: Pairs of steel bars, usually angle-shaped to fit snugly between the top (head) and bottom (base) of the rail, are bolted through pre-drilled holes in the rail web.

• Load Distribution: As train wheels pass, the joint bars distribute the high impact forces across the two rail ends.

• Flexibility and Expansion: Joint bars allow for a small, engineered gap between rail ends to accommodate thermal expansion and contraction.

• Alignment: They maintain both horizontal and vertical alignment to keep the track straight and level.

• Types: Standard joint bars are used for regular joints, while insulated joint bars are utilized to prevent electrical current from flowing between track circuits.

Is it mandatory to use rail joint bars in railways?

Rail joint bars (or fishplates) are not universally mandatory, as modern railways frequently use Continuous Welded Rail (CWR) to eliminate joints for smoother, faster travel. However, they are essential and required in specific applications, including bolted track, insulating sections for signaling, and connecting switches or special trackwork.

Key Instances Requiring Rail Joint Bars:

• Conventional/Jointed Track: Necessary to connect individual rail lengths, allowing for thermal expansion and contraction.

• Insulated Rail Joints (IRJs): Mandatory for track circuits in signaling systems to electrically isolate sections.

• Switch and Crossing Areas: Used at switches and to bridge specific, non-welded track gaps.

• Temporary Repairs: Used to secure broken rails until they can be welded.

While CWR reduces the need for frequent joints, joint bars remain a crucial component for structural integrity in specific, designated, or traditional applications.

Specifications of rail joint bar

Rail joint bars (fishplates) are designed to connect rail ends, ensuring stability, structural strength, and continuity. Common specifications include 4-hole (24") or 6-hole (36") lengths, manufactured from high-carbon steel (e.g., 45#, 50#, or 55#) or alloy steel (42CrMo), adhering to standards like AREMA, UIC, BS, or GB. They are hot-rolled and can be heat-treated for improved strength.

Founded in 2008, GNEE RAILWAY RAILWAYL 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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