A rail pad, also called rail rubber plate, is designed between the rail tie plate and foot of the rail, made by an elastic polyurethane mat, which is interposed between steel rails and tie sleepers to protect the sleeper top from wearing and impacting.
What is the full form of GRP in railway?
Grooved Rubber Sole Plate (GRSP) is placed between Rail and sleeper. It gives cushioning effect and prevents damage to sleepers. There are different types of Grooved Rubber Sole Plates for different type of sleepers and also different for Turnout, Steel channel sleepers, Guard rail portion, etc.
What is the full form of Cgrsp in railway?
Railway pads are cushioning materials placed between rails and sleepers to absorb vibrations, reduce noise, and protect the track structure. Composite grooved sole plates(Cgrsp) enhance load distribution and track stability.
What materials are used in composite grooved sole plates?
They are made from high-quality composite rubber compounds that offer durability, elasticity, and resistance to weather and mechanical stress.
| Parameter Item | Specification | Test Standard |
|---|---|---|
| Hardness | 75–90 Shore A | ASTM D2240 |
| Tensile Strength | ≥ 18 MPa | ASTM D412 |
| Elongation at Break | ≥ 300% | ASTM D412 |
| Compression Set | ≤ 25% (70°C, 22h) | ASTM D395 |
| Aging Resistance | Tensile Strength Retention ≥ 85%; Elongation Retention ≥ 80% (100°C, 72h) | ASTM D573 |
| Temperature Resistance Range | -40°C to 70°C | ISO 187 |
| Abrasion Resistance | ≤ 150 mm³ (DIN) | ISO 4649 |
| Oil Resistance | Volume Change ± 5% (IRM 903 oil, 100°C, 24h) | ASTM D471 |
| Weather Resistance | No cracking, no significant discoloration after 1000h UV aging | ISO 4892 |
What is the difference between CGRSP and GRSP?
The difference is that GRSP (Grooved Rubber Sole Plate) is the general category for rubber pads under railway tracks, while CGRSP (Composite Grooved Rubber Sole Plate) is a specific, advanced type of GRSP made from two bonded layers of different rubber compounds, offering superior cushioning and elasticity compared to single-compound GRSPs, used for better shock absorption and rail stability, especially on curves. Essentially, a CGRSP is a GRSP, but with enhanced composite construction for better performance.
GRSP (Grooved Rubber Sole Plate) (General)
- Function: Placed between rail and sleeper (tie) to provide cushioning, electrical insulation, and prevent sleeper damage.
- Material: Typically made from a single type of rubber compound.
- Application: Used across various track types, including wooden and concrete sleepers.
CGRSP (Composite Grooved Rubber Sole Plate) (Specific)
- Function: Offers improved vibration dampening and shock absorption due to its layered structure.
- Material: Consists of two distinct rubber layers (harder top layer for the rail, softer bottom layer for the sleeper) integrally vulcanized.
- Application: Often used on sharp curves and for wider base PSC (Prestressed Concrete) sleepers, providing better performance and longevity.
As a professional rubber rail pad manufacturer GNEE RAIL can produce various standards of rubber rail pads and other rail fasteners. If you want to build a railway line, do not hesitate to contact us, we can supply all types of rubber rail pads with different materials. If necessary, we can make customized rubber rail pad production.
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