Are rail elastic clips required in wooden sleepers?
In wooden sleeper track systems, rail elastic clips are not the only option, but their application is gradually becoming more common. Traditional wooden sleeper tracks primarily use rail spikes for fastening, where wedge-shaped spikes are driven directly into the sleeper to restrain the rail.
While this method is lower in cost, it has inherent drawbacks including weak gauge retention, susceptibility to loosening, and poor vibration damping. In contrast, elastic clip systems utilize the continuous elastic pressure of spring steel to provide more stable gauge control and superior vibration damping performance, making them particularly suitable for lines with speeds exceeding 80 km/h.
Applying modern elastic clip systems to wooden sleepers requires technical adaptation. Plastic nylon sleeves or special metal liners are typically embedded in the wooden sleeper to provide sufficient pull-out resistance and distribute stress.
| Name | Rail clip | |||
| Type | E clip (e1809, e2006,e2007,e2009,etc) | |||
| Skl clip (skl1,skl3,skl12,skl14) | ||||
| Or the type by customers' drawings | ||||
| Material | 60Si2MnA | 60Si2CrA | 55Si2Mn | 38Si7 |
| Chemical composition(%) | C:0.56-0.64, Mn:0.60-0.90, Si:1.60-2.00, Cr:≤0.35, P:≤0.03, S:≤0.03 | C:0.56-0.64, Mn:0.40-0.70, Si:1.40-1.80,Cr:0.70-1.00 P:≤0.03, S:≤0.03 | C:0.52-0.60, Mn:0.60-0.90, Si:1.50-2.00,Cr:≤0.35 P:≤0.03, S:≤0.03 | C:0.35-0.42, Mn:0.50-0.80, Si:1.50-1.80, P:≤0.03, S:≤0.03 |
| Hardness | For e clip: 44-48HRC | |||
| For skl clip: 42-47HRC | ||||
| Fatigue life | for Dia.18 is 3 millions cycles without breaking | |||
| for Dia.20 is 5 millions cycles without breaking | ||||
| Surface | plain (oiled), Oxide black, color painting, HDG, Zinc Plating... | |||
| Standard refers | DIN17221, BS970, GB/T1222 | |||
During installation, threaded spikes are used instead of traditional drive-on spikes, allowing precise application of clamping force through torque control. This improved solution extends the maintenance cycle of wooden sleeper tracks by 2-3 times and keeps variations in track geometry within a tighter range.
From a techno-economic perspective, the application of elastic clips on wooden sleepers requires comprehensive evaluation. Traditional spikes still hold a cost advantage for branch lines with lower traffic volume or yard tracks. However, the technical advantages of elastic clips become more significant on curved sections or in areas requiring higher stability.
GNEE RAIL can provide complete elastic clip solutions for wooden sleeper tracks, including specialized liners, corrosion-treated threaded spikes, and matching installation tools, assisting clients in upgrading traditional infrastructure with modern track technology.
