Rail pads are a critical component in the railway infrastructure that plays a vital role in ensuring the safe and efficient operation of trains. A rail pad is a resilient layer that sits between the rail and the tie, serving as a cushioning material that absorbs the dynamic forces generated by the trains. The primary function of rail pads is to reduce the impact and vibration caused by the passing trains, thereby preventing damage to the rail and the surrounding components.
What is the acceptable compressive deformation limit for rail pads?
Rail pad acceptable deformation limits focus on compression set (permanent loss of height), typically under 30% for rubber pads after heat aging, and stiffness (how much force causes how much deflection) which varies by application (e.g., 80-150 kN/mm for medium stiffness). Limits ensure the pad retains its elastic cushioning, preventing excessive track movement or increased stress, with standards requiring tests for permanent set (e.g., $\le$25-30% after aging) and load-deflection.
Factors Influencing Limits:
- Material: Rubber, HDPE, or composite pads have different performance curves.
- Track Type: High-speed, heavy haul, or metro lines require different stiffness/damping.
- Environmental Factors: Temperature and aging (fatigue) affect stiffness and set.
A range of high-performance elastic rail pads have been developed for stiffness requirements and various application areas-from trams through standard gauge railways to heavy haul lines, this especially suitable for E-type rail fastening systems and SKL-type rail fastening system with material of HDPE/EVA/Rubber, the following parameters for reference.
| Raw Material | Rubber, EVA, TPEE, HDPE |
| Standard | UIC, AREMA, TB/T2626-95 |
| Application | 43kg/m, 50kg/m, 60kg/m, 75kg/m,115RE, UIC54, UIC60, S49 |
| Model number | 43-7-7, 43-10-7, 50-7-9, 50-10-9, 60-10-17, 60-12-17 |
| Operating temperature | -50~70 degrees |
| Certificate | MSDS, ROHS, REACH |
| Notes | They should be stored in a clean, ventilated place. Don't be in direct sunlight, and keep away from the heat source and chemical reagent. Don't touch the oil, organic solvent, and other chemicals. Banned exposure. |
As a professional rail fastener manufacturer, GNEE RAIL can produce various types of rubber rail pads with different materials, such as natural rubber, EVA, HDPE and so on. In railway fastening system, rubber rail pads are often installed between the rail tracks and the concrete railway sleepers.