WJ7 Height-Adjusting Pad

The WJ7 Height-Adjusting Pad is a precision-engineered railway component specifically designed for use in WJ7 rail fastening systems. It serves as a critical adjustment element placed beneath the rail or under-rail pad to achieve accurate track geometry and optimal rail alignment. Manufactured from high-quality rubber, EVA, or composite polymer materials, the WJ7 Height-Adjusting Pad provides excellent compression strength, elasticity, and long-term dimensional stability. Its purpose is to compensate for minor height variations in the track structure, ensuring smooth train operation and consistent rail performance.

Produced through advanced molding and cutting processes, each pad features precise thickness control, typically available in 1 mm to 10 mm increments, and can be customized according to project specifications. The pad’s durable material composition offers outstanding resistance to aging, deformation, water absorption, and temperature fluctuations, guaranteeing reliable performance under continuous mechanical stress. With its compact design and easy handling, the WJ7 Height-Adjusting Pad ensures simple installation and replacement, making it ideal for both new track construction and routine maintenance operations.

Function & Application
The WJ7 Height-Adjusting Pad plays an essential role in maintaining accurate rail height and alignment within WJ7 fastening systems. Its main function is to finely adjust the vertical position of the rail to meet precise engineering requirements, compensating for irregularities caused by sleeper tolerances, track settlement, or installation variations. By maintaining consistent rail elevation, the pad helps ensure uniform wheel-rail contact, reducing vibration, noise, and uneven wear during train operation.

Beyond height adjustment, the pad provides an additional cushioning effect, absorbing part of the dynamic load transmitted through the rail and improving overall track elasticity. This function helps to reduce stress on sleepers and fastening components, extending their service life and maintaining long-term track stability. The pad’s non-slip surface design ensures firm placement under the rail, preventing shifting or displacement even under high dynamic forces and heavy axle loads.

The WJ7 Height-Adjusting Pad is widely applied in high-speed railways, heavy-haul freight lines, metro systems, and standard mainline tracks utilizing the WJ7 fastening standard. It is compatible with concrete and composite sleepers and can be used together with under-rail pads, rail clips, and insulating components as part of a complete rail fastening assembly. Installation is quick and efficient, requiring no special tools, and the pads can be stacked or combined to achieve the desired height adjustment precisely and safely.

Manufactured in accordance with international standards such as UIC, AREMA, and EN, the WJ7 Height-Adjusting Pad can be customized in hardness, thickness, and material composition to meet specific environmental or mechanical conditions. It also contributes to sustainable rail infrastructure through the use of recyclable and eco-friendly materials, supporting reduced waste and long-term cost efficiency.

In summary, the WJ7 Height-Adjusting Pad provides a precise, durable, and flexible solution for maintaining optimal rail alignment and smooth train operation. With its excellent dimensional accuracy, load-bearing capacity, and resistance to wear, it ensures improved track stability, reduced maintenance requirements, and enhanced performance in all types of modern railway systems.

I. Overview of Railway Track Padding

Rubber track pads (hereinafter referred to as “rubber pads”) are critical components in railway track structures. Installed between rails and concrete sleepers, their primary functions include:

- Absorbing high-speed vibrations and impacts generated by passing vehicles to protect the subgrade and sleepers

- Providing electrical insulation for signaling systems Additionally, due to prolonged exposure to atmospheric conditions, rubber pads must exhibit excellent resistance to natural aging, cold temperatures, and heat. Rubber pads used in subways feature superior vibration damping and low-noise performance.

II. Characteristics of Railway Track Padding

1. Strong shock absorption, anti-aging properties, wear resistance, stability, and resistance to high and low temperatures. Products combine natural rubber, styrene-butadiene rubber, neoprene, HDPE, EVA, and high-density polyethylene. They exhibit high elasticity and resist deformation or fracture across various temperatures.

2. Extended service life with low maintenance and replacement costs.

3. Comprehensive range of models suitable for laying various rails (43kg, 50kg, 60kg) and sleepers (wooden, concrete).

4. Excellent load-bearing capacity, vibration damping, and insulation properties. Highly wear-resistant with minimal compression deformation, superior rigidity, aging resistance, and no mud displacement. Long service life and easy installation. Railway rubber pads significantly enhance rolling stock transport capacity, reduce crossing maintenance frequency, and prevent traffic accidents caused by stalled vehicles.

5. Rubber pads offer a service life exceeding three times that of traditional track plates. Testing confirms stable performance without deformation under applied pressures exceeding 80 tons. Manufactured primarily from rubber using scientific formulations and advanced production techniques, these pads meet railway speed enhancement and environmental requirements while boosting locomotive transport capacity.

Our factory is equipped with multiple guide rail pad production lines featuring machinery for machining, injection molding, rubber refining, vulcanization, forming, and inspection. We have our own rail pad development engineers, designing, producing and inspecting. What’s more, rail pads for high-peed rail are our featured products, including both the elastic rubber plates and height adjustment pads.

The Following are Rubber Rail Pads Parameters：