Steel Rail Fasteners Railway Fish Plate

Steel Rail Fasteners Railway Fish Plate

In rail terminology, fish plate, splicing rod or connecting rod is a kind of metal rod, which is fixed at the ends of two rails with bolts to connect them together to form a track. The top and bottom edges taper inward so that when bolted in place, the device wedges itself between the top and bottom of the guide rail. In railway transportation modeling, the fish plate is usually a small copper or nickel silver plate that slides onto two tracks to provide the function of maintaining alignment and electrical continuity.
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Description
Technical Parameters

Fishplate vs. Welded Joints

Comparison Item Fishplate Joint Welded Joint
Strength 70-80% of rail strength 100% rail strength
Maintenance Requires periodic bolt tightening Near maintenance-free
Speed Limit ≤160 km/h 350 km/h+
Emergency Repair Quick replacement (30 min/joint) Requires cutting/rewelding (4+ hrs)
 

Functions of Railway Fishplates (Joint Bars)

Functional Aspect Key Role Technical Principle
Rail Connection Mechanically joins rail ends, transmitting longitudinal forces (traction/braking) Frictional clamping via bolt preload (400-500 N·m)
Gap Control Maintains rail gap (4-6mm) to reduce wheel impact Tight contact with rail web restricts displacement
Electrical Continuity Conducts track circuit signals (non-insulated: resistance ≤0.1Ω) Metal-to-metal contact surfaces
Stress Distribution Reduces localized stress at rail ends (prevents head checks) Load dispersion across joint area
 

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Steel Rail Fasteners Railway Fish Plate

Steel Rail Fasteners Railway Fish Plate

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