Description
Technical Parameters
Railway Fish Plate / Splice Bar Specification
| Feature / Aspect | Description & Primary Function | Types & Design Variations |
|---|---|---|
| Primary Name | Fish Plate (UK/Commonwealth) | Splice Bar (North America) |
| Typical Material | Medium Carbon Steel or High Strength Low Alloy (HSLA) Steel. | Often heat-treated for increased strength and wear resistance. |
| Bolt Holes | Typically 4 or 6 holes for fish bolts. Hole design is critical to avoid stress concentrations. | Oval Holes: Allow for thermal expansion/contraction of the rails. Circular Holes: Used with shouldered bolts to control clamping force. |
| Common Types | 1. Standard Fish Plate: For most common rail joints. | 2. Compromise Fish Plate: Used to join two different rail sections (e.g., UIC 54 to UIC 60). |
| Specialized Types | 4. Insulated Fish Plate: Has insulating materials to break the electrical continuity for track circuit signaling. | 5. Heavy-Duty / Reinforced Fish Plate: Thicker and stronger for high-stress areas like joints approaching b |
Key Functions and Importance:
- Maintain Alignment: The primary job is to hold the two rail ends in perfect vertical and horizontal alignment to ensure a smooth and safe ride.
- Transfer Load: It transmits the wheel load from one rail section to the next, minimizing the impact and dip at the joint.
- Resist Forces: It must resist bending and shear forces caused by passing trains.
- Accommodate Expansion: The design (especially oval bolt holes) allows the joint to expand and contract with temperature changes without building up dangerous internal stresses.
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