The function of rail fastening system is to fix rails to railway sleeper or railroad ties. Generally, a rail fastening system is consisted of rail anchors, rail tie plates, chairs, fasteners, spikes, bolts, etc.
Design criteria of rail fastening system
There are strict criteria on producing rail fastening system; this is because the safety of rail road can't be compromised. We should consider the features of rail fastening system and then produce the most reliable finished products.
Rail clamping force. Clamping forces may be difference according to different kinds of fastening system and customer requirements. Generally, most fastening systems offer a clamping force between 7.5 to 12.5 KN with deflections of the clips toe between 10 and 15mm. According to European standards, for most main line railroad track the minimum force to push the rail through the fastening system is 7kN and 9 KN for high speed rail and heavy freight lines.
Anchor/shoulder. The shoulder/anchor is quite important in fastening system. It has to withstand the impact of loads and vibration transmitted to the sleeper under the circumstances of protecting the sleeper from breaking or getting loose. Based on the European standard, all the parts of fastening should be able to withstand a 60KN pullout force without breaking the sleeper.
Insulator. In order to stop the wearing of other fastening components, insulator is necessary, it works as a cushion. So the materials must be resistant to wear, can attack form chemical and can degrade from ultra violet light. As the change of nature of the signaling and electrical systems, the requirements of insulator are different.
Rail pads. Sometimes, there is heavy burden in the rail and the bad joints, track irregularities and faults in rolling stock can strength the load. In order to solve the problem, rail pads can come into play. Usually, the rail pad is made of rubber with 10 mm thick, and is a plastic such as EVA between 5 mm and 10 mm thick. The typical stiffness of the pad is in the rang 40-450 kN/mm and the 5 mm plastic pad can offer stiffness as high up to 6000 kN/mm.
| Technical Parameter | Unit | Value |
| Stiffness | KN | 90-130 |
| Hardness Shore A | ℃ | 72-80 degree |
| Electronic Resistance | Ω | ≥ 106 |
| Tensile Strength before Aging | Mpa | ≥12.5 |
| Elongation before Aging | % | ≥250 |
HDPE railway pad
| Technical Parameter | Unit | Technical Requirement | Value |
| Density | g/cm3 | 0.95-0.98 | 0.95 |
| Tensile Strength | Mpa | ≥19 | 19 |
| Elongation | % | >80 | 150 |
| Melting Point | ℃ | 170-190 | 190 |
| Insulation Resistance | Ω | ≥1×1010 | 3.5 ×1010 |
| Hardness | A | ≥98 | 98(A) |
As an internationally leading supplier of railway permanent way equipment, GNEE RAIL specializes in providing comprehensive fastening system solutions for the global rail transit sector. We professionally manufacture various types of high-performance railway fasteners, including but not limited to Type III elastic clip fastening systems, heavy-duty track bolts, composite insulating gaskets, rail clamping devices, sleeper embedded parts, anti-loosening fastening components, railway-specific washers, high-strength fish bolts, track elastic clips, insulating buffer pads, railway anti-vibration accessories, turnout-specific fasteners, gauge locking devices and other core products.
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