Rail pads are elastic polyurethane mats which are interposed between steel rails and railway sleepers to protect the sleeper top from wearing and impacting.
The starting stiffness of a rail pad is designed to not be high so that their relative deformation under the spring clip toe loads is greatly substantial. In this way, it can guarantees the rail pad maintaining in close contact with the rail despite of any vertical movements of the latter. In addition, the reason why rail pads made up of rubber or plastic is to dampen the shocks of vibration of a passing train.
How do railway pads reduce railway noise?
Railway pads reduce noise by acting as elastic cushions between the steel rail and the concrete/wood sleeper, absorbing vibrations and dampening high-frequency sounds at the source, preventing direct metal-to-metal contact, and dissipating energy, resulting in quieter operation, more comfortable rides, and reduced track wear by isolating the track structure.
How rail rubber pad Work:
- Vibration Absorption: Made from rubber or polymer materials, pads soak up the impact energy from wheels, preventing it from traveling through the sleepers and ballast into the ground and buildings.
- Frequency Damping: Advanced pads are engineered with specific stiffness and viscoelastic materials to target and dampen the 500-2000 Hz frequency range, where most noise is generated.
- Isolation & Cushioning: They create a soft barrier, minimizing direct contact and mechanical coupling between the rail and sleeper, which stops loud, banging noises from forming.
- Energy Dissipation: The pads spread out the vibration energy over a larger surface area and dissipate it as heat, rather than letting it radiate as sound.
- Improved Load Distribution: By distributing the train's load more evenly, they reduce stress and shock on the track components, decreasing wear and tear that also contributes to noise.
The important role of railroad pads in rail fastening systems
Rail pads are crucial in rail fastening systems, acting as elastic buffers between the rail and sleeper to distribute loads, absorb shocks, reduce vibration and noise, prevent wear/damage (spalling/cracking), and maintain track stability for longer component life and better passenger comfort, protecting the entire infrastructure from high-speed impacts and stresses.
Benefits of Using Rail Pads:
- Extended Lifespan: Reduces wear, significantly prolonging the life of sleepers, fasteners, and the track itself.
- Enhanced Safety & Stability: Maintains track geometry and prevents component failure from sustained stress.
- Greater Passenger Comfort: Lower vibration levels lead to a smoother ride.
- Reduced Maintenance: Less wear and tear means fewer repairs and replacements are needed.
- Environmental Benefits: Lower noise levels help with community relations, especially in urban areas.
The rail padsGNEE RAIL produced apply for rails such as rail UIC54, UIC60, BS80lbs,BS100lbs, and we can produce different sizes according to your needs. Our rail pads all pass advanced testing tools and the ISO9001-2008 standard.