Description
Technical Parameters
Railway Fish Plates: Technical Data Sheet
| Aspect | Description & Details |
|---|---|
| Product Name | Rail Fish Plate (Commonly known as: Joint Bar, Splice Bar, Angle Bar) |
| Main Applications | - Rail Joints: Traditionally used throughout the track. - Insulated Joints: Where an electrical barrier is needed for signaling blocks. - Breathing Lengths: On long welded rail (LWR) tracks to manage thermal expansion. - Turnouts & Crossings: At complex junctions. - Temporary Repairs: As a quick fix for a fractured rail. |
| Critical Parameters | - Compatible Rail Section: Must match the rail profile (e.g., 115RE, UIC60, 50kg). - Tensile Strength: Must meet or exceed the strength of the rail it joins. - Bolt Hole Tolerance: Holes must align perfectly with the rail web holes. |
Comparison of Joint Types
| Feature | Bolted Joint (Using Fish Plates) | Welded Joint (CWR) |
|---|---|---|
| Strength & Smoothness | Weaker: The joint is a point of weakness, creating a "click-clack" sound and vibration. | Stronger & Smoother: Continuous rail provides a seamless, stronger ride. |
| Maintenance | High: Requires frequent inspection and re-tightening of bolts. Joints wear out faster. | Low: Virtually maintenance-free after installation. |
| Application | Traditional method, now mainly used where necessary (e.g., insulated joints, breathing lengths). | Modern standard for mainlines: Creates Continuous Welded Rail (CWR). |
| Cost | Lower initial cost, higher lifetime maintenance cost. | Higher installation |
Advantages & Disadvantages
| Advantages | Disadvantages |
|---|---|
| ✅ Essential for Functionality: Critical for creating insulated joints and managing expansion. | ❌ Track Weakness: Creates a point of flexibility and impact in the track. |
| ✅ Allows for Expansion: Necessary for jointed track where rails expand/contract. | ❌ High Maintenance: Bolts can loosen, and the plates and rail ends can batter and wear. |
| ✅ Simple Installation & Repair: Can be installed with basic tools for temporary fixes. | ❌ Rough Ride: Creates noise and vibration, reducing passenger comfort and increasing rolling resistance. |
| ✅ Cost-Effective Solution: For low-speed lines and temporary installations. | ❌ Increased Operating Costs: Leads to higher fuel consumption for trains and damage to both track and rolling stock. |
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