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In the Nabla rail fastening system, the trapezoidal component refers to the lateral insulator (also known as a guide plate or rail liner). While a standard rectangular "rail pad" sits beneath the rail foot, these trapezoidal insulators are installed on either side of the rail foot, between the rail and the concrete sleeper shoulder or baseplate, to provide critical electrical insulation and lateral stability.
Key Components & Placement
Key Components & Placement
Insulating Rail Pad: A resilient rectangular mat placed directly under the rail foot to reduce vibration and protect the sleeper.
Trapezoidal Lateral Insulator: These are specialized, shovel-shaped components with a round center hole that fit around the Nabla clip. They regulate the track gauge and prevent electrical leakage to the clips and spikes.
Technical Performance
Technical Performance
The trapezoidal lateral insulators must meet rigorous durability and safety standards:
Functions in the Nabla System
Functions in the Nabla System
Gauge Correction: By using insulators of varying widths, the track gauge can be adjusted in increments (e.g., 1.25mm) to correct alignment.
Electrical Isolation: Essential for the reliable operation of signal systems by preventing current from passing into the concrete sleeper.
Lateral Support: The trapezoidal shape acts as a guide to transfer lateral forces from the train into the concrete sleeper, protecting the double-end screw spikes from shearing or bending.
Load Distribution: Distributes the toe load of the Nabla spring steel clip over a broader section of the rail foot.
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