Fishplates are critical components for connecting railway rails, but certain common issues may arise during long-term use. If not addressed promptly, these problems can affect track safety and operational smoothness.
Firstly, loose or detached bolts are one of the most common issues. Vibrations, impact forces, and temperature variations during train operation can gradually cause bolts to loosen, leading to connection failure between the fishplate and the rail. This may result in displacement or excessive gaps at the rail joint, increasing the risk of derailment.
Secondly, fishplates may develop cracks or fractures. Prolonged exposure to repetitive train loads and environmental stress, particularly on heavy-haul or high-speed railways, can cause fatigue cracks in fishplates. If the fishplate material does not meet standards or the heat treatment process is inadequate, cracks may propagate rapidly, leading to serious track structure failures.
Thirdly, corrosion and rust are also common issues with fishplates. Installed on outdoor tracks and constantly exposed to rain, moisture, salt, or industrial environments, fishplates are prone to rusting if anti-corrosion measures are insufficient, such as lack of galvanization or damage to protective coatings. This reduces their strength and fastening performance.
Additionally, excessive joint gaps can cause fishplate failure. When rail end surfaces are unevenly machined, installation bolts are not properly tightened, or tracks expand due to temperature changes, excessive gaps may form at rail joints. This increases impact forces during train operation, leading to sleeper wear and track irregularities.
To prevent the above issues, fishplates should be made of high-strength steels that comply with international standards, such as Q235, 45#, or 40Mn2, and used in conjunction with fasteners like bolts, rail clips, rail pads, and rail tie plates. Regular inspections should be conducted to check bolt tightness, corrosion status, and crack development.
GNEE RAIL supplies high-quality fishplates made from materials that meet UIC, AREMA, and EN standards. We also provide complementary railway fasteners such as rail clips, rail pads, rail tie plates, rail bolts, and crane rail clips, along with customized design, installation guidance, and after-sales technical support to help customers reduce the risk of common fishplate issues and ensure long-term safe and stable track operation.
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