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Type VII Rail Fastener System
The Type VII elastic clip railway fastener system is a heavy-duty fastening solution for heavy-haul freight lines. GNEE RAILWAY RAILWAY supplies the complete system - T-bolts, nuts, flat washers, elastic clips, insulated gauge blocks, gauge baffles, under-rail pads, pre-embedded iron seats and height-adjusting pads - for 75 kg/m and 60 kg/m rails.
Scope of Application:
- Heavy-haul freight lines laid with 75 kg/m or 60 kg/m rails.
- Maximum train axle load of 30 t and maximum speed of 120 km/h.
- Ballasted tracks with shoulderless prestressed concrete sleepers, or elastic bearing-block ballastless tracks.
- Minimum curve radius of 400 m.
Components of Type VII Railway Fastener System
T-bolts are divided into Type I and Type II (T2-I, T2-II). Type I is used for normal assembly or where the height adjustment is not greater than 10 mm; Type II is used where the height adjustment exceeds 10 mm.
Gauge baffles
Two types of gauge baffles are available, No. 7 and No. 11 (MG-7, MG-11). For standard gauge, No. 7 is used on the outer side and No. 11 on the inner side.
Insulated gauge blocks
Insulated gauge blocks are divided into Type I and Type II, matched with 60 kg/m and 75 kg/m rails respectively:
- Type I includes Nos. 8, 10, 12, 14 and 16 (G7-60-8/10/12/14/16). For standard gauge, No. 14 is used on the outer side and No. 10 on the inner side.
- Type II includes Nos. 9, 11, 13 and 15 (G7-75-9/11/13/15). For standard gauge, No. 13 is used on the outer side and No. 11 on the inner side.
Under-rail height-adjusting pads
The under-rail height-adjusting pads are divided into three thicknesses: 1 mm, 2 mm and 5 mm (TD7-5). They are placed between the under-rail pad and the rail-bearing surface, or between the under-rail pad and the under-gauge-baffle height-adjusting pad.
Height-adjusting pad under gauge baffle
The height-adjusting pads under the gauge baffle are divided into two thicknesses: 5 mm and 10 mm (DTD-5/10). They are placed between the under-rail pad and the rail-bearing surface, or between the under-rail height-adjusting pad and the rail-bearing surface.
VII Type Fasteners System Functional Features
| Functional Aspect | Description |
|---|---|
| Elastic rail clamping | Stable and continuous toe load from the spring-steel clip, maintaining rail position under dynamic loads |
| Vibration and noise reduction | Rail pad and elastic clip work together to attenuate wheel-rail vibration and structure-borne noise |
| Gauge retention | High lateral restraint to control gauge widening, suitable for heavy axle load and metro lines |
| Rail uplift control | Effective resistance to vertical uplift from traction, braking and wheel impact forces |
| Rail creep resistance | Adequate longitudinal resistance to limit rail movement along the track |
| Electrical insulation | Insulating pads and guide plates ensure isolation between rail and sleeper for signaling systems |
| Fatigue durability | Designed for long-term cyclic loading with stable clamping force over millions of load cycles |
| Sleeper-type adaptability | Compatible with concrete sleepers and slab-track embedded inserts |
| Installation convenience | Clip-in structure allows fast manual or mechanized installation and replacement |
| Maintenance efficiency | Individual components (clip, pad, insulator) can be replaced without removing the rail |
| Environmental adaptability | Suitable for temperature variation, humidity, dust and moderate corrosion environments |
| System compatibility | Matched with multiple rail sections (UIC, EN, GB, AREMA) through pad and insulator design |
Type VII clip Fastenering System Application
The modular design supports gauge adjustment of ±12 mm and height adjustment of up to 20 mm. Insulating components meet the requirements of electrified railway track circuits and stray current protection.
FAQ
- Which rails is the Type VII system suitable for?
It is designed for heavy-haul freight lines with 75 kg/m or 60 kg/m rails, up to 30 t axle load and 120 km/h, on ballasted or elastic bearing-block ballastless tracks.
- What height adjustment is available?
Up to 20 mm of height adjustment using under-rail height-adjusting pads (1/2/5 mm) and gauge-baffle height-adjusting pads (5/10 mm); T-bolt type selection depends on the adjustment amount.
- Can the components be replaced individually?
Yes. The clip-in structure allows individual components to be replaced without removing the rail, simplifying maintenance.
- Do you supply the system for other rail sections?
Yes. Pad and insulator designs can be matched with UIC, EN, GB and AREMA rail sections; confirm your rail profile with our engineers.
Request a Quotation
Send your rail section, sleeper type, adjustment requirements and quantity to our sales team or use the Inquiry form - we will confirm specifications, testing and delivery within 24 hours.
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