A rail fish plate is a mechanical rail-joint element that restores effective sectional strength at the joint by clamping the rail webs together, allowing bending moments to pass across the connection. GNEE RAIL supplies fish plates suitable for GB 8–60 kg/m rails, UIC rails, BS11 sections, JIS rail profiles, AS1085 rails, AREMA/ASCE standards, and crane rail applications under DIN536 and QU specifications, along with material certification support.
| Standard | Type | Length/Diameter | Weight /Material | |
| AREMA 2007 | 115RE | 4 hole-24" | 17.04Kg | 45# chemical |
| 115RE | 6 hole-36" | 25.56Kg | composition(%): | |
| 132-136RE | 4 hole-24" | 17.75Kg | C: 0.42-0.50 | |
| 132-136RE | 6 hole-36" | 26.63Kg | Mn: 0.50-0.80 | |
| UIC864 | UIC60 | 4 hole-630/Φ26 | 18.07Kg | Si: 0.17-0.37 |
| UIC60 | 4 hole-600/Φ28 | 17.47Kg | Cr: ≤0.25 | |
| UIC60 | 4 hole-630/Φ25 | 18.1Kg | P: ≤0.035 | |
| UIC54 | 4 hole | 14.34Kg | S: ≤0.035 | |
| UIC54 | 6 hole-800 | 19.94Kg | ||
| BS 47-1 | BS75R | 4 hole | 6.56Kg | |
| BS60A | 4 hole | 5.61Kg | ||
| BS80A | 4 hole | 6.5Kg | ||
| BS90A | 685.8/Φ26 | 13.23Kg | 50# chemical | |
| BS90A | 792.9/Φ26.2 | 15.34Kg | composition(%): | |
| BS100A | 4 hole | C: 0.62-0.70 | ||
| 90/91LB | 4 hole | 18.08Kg | Mn: 0.50-0.80 | |
| 90/91LB | 6 hole | 19.9Kg | Si: 0.17-0.37 | |
| AS | 50kg | 4 hole | 14.3Kg | Cr: ≤0.25 |
| 50kg | 6 hole | 19.5Kg | P: ≤0.035 | |
| S49 | 4 hole | 9.71Kg | S: ≤0.035 |
What is an insulated rail joint? What is its function?
An insulated rail joint (IRJ) is a specialized, durable rail connector that joins two rail ends while electrically isolating them from each other. Using insulating materials like composite, polymer, or fiberglass for the fishplates, bolts, and end posts, it breaks the circuit flow to enable track circuits for train detection and signalling.
Key Functions of an Insulated Rail Joint:
- Track Circuit Segmentation: They divide the railway track into separate, electrically isolated sections (blocks), allowing signaling systems to identify the precise location of a train.
- Train Detection and Safety: By preventing electrical current from flowing between adjacent rail sections, they ensure signals correctly show when a block is occupied, preventing collisions.
- Broken Rail Detection: They are critical components in safety systems that detect if a rail has snapped.
- Structural Connectivity: Despite providing electrical isolation, they securely join rail ends, including in continuously welded rail (CWR) applications.
Insulated joints are often bonded to withstand high structural loads and are designed to prevent short circuits, requiring durable materials to resist heavy traffic and environmental conditions.
Why Monitor Insulated Rail Joint Conditions?
Monitoring insulated rail joint (IRJ) conditions is critical to ensure train safety, prevent signaling failures, and minimize expensive, unplanned maintenance. As high-stress components, IRJs are prone to degradation-such as insulation loss or bolt failure-which can cause track circuit faults and service disruptions. Monitoring helps move from reactive to predictive maintenance.
Key Reasons for Monitoring Insulated Rail Joint Conditions:
- Safety Assurance: IRJs are highly stressed components. Monitoring their structural integrity prevents accidents caused by joint failures, such as cracks, bolt breakage, or complete insulation breakdown.
- Signaling Reliability: IRJs electrically isolate track sections for signalling systems. If the insulation breaks down, it can cause short circuits, leading to false signal indications and unnecessary train delays.
- Preventative Maintenance and Reduced Costs: Rather than relying on costly, scheduled, or emergency repairs, monitoring allows for condition-based maintenance, extending the life of the joint and reducing total lifecycle costs.
- Structural Integrity: Monitoring measures gap width changes, which can indicate if the joint is operating correctly, preventing problems like rail buckling caused by thermal expansion.
- Operational Efficiency: Identifying degradation (such as lost stiffness) early through techniques like axle box acceleration (ABA) allows repairs to be scheduled, preventing track closures.
Founded in 2008, GNEE RAIL 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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