Insulating Track Fastening System

Key Features

Incorporates a silicon-based nanocoating on the rail web and foot to establish a primary dielectric barrier.

Optimizes clearance at critical interfaces—clip-to-rail and baseplate-to-sleeper—to substantially extend creepage distance.

Maintains stable insulation performance under both pristine and long-term service conditions, resisting degradation from contamination or moisture.

Ensures signal integrity and prevents stray-current corrosion of track substructure, thereby enhancing overall system reliability.

product details

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Structure

The system comprises the following components

Type Ⅲ spring clip

Insulating gauge block

Screw spike (or lag screw)

Spring washer

Flat washer

Rail pad (elastic pad under rail)

Insulating layer

Insulating bushing (or insulating sleeve)

Iron baseplate (or steel tie plate)

Gauge-adjusting plate (or adjustment plate)

Baseplate elastic pad (elastic pad under baseplate)

Coupling pad (or combined underlayment pad)

Embedded sleeve (or cast-in socket)

Sleeper (or tie)

Technical Specifications

Parameter	Specification
Clamping force	≥ 22kN
Longitudinal resistance (per set)	≥ 7 kN
Static stiffness (per node)	30 ± 5 kN/mm
Dynamic-to-static stiffness ratio	≤ 1.4
Fatigue life (load cycles)	3 × 10⁶ (no component damage)
Gauge widening (after fatigue, unilateral)	≤ 2 mm
Clamping force change rate (fatigue)	≤ 20%
Longitudinal resistance change rate (fatigue)	≤ 20%
Static stiffness change rate (fatigue)	≤ 25%
Node insulation resistance (dry)	≥ 10⁶ Ω
Inter-rail insulation resistance (wet)	≥ 15 kΩ
Pull-out resistance (embedded sleeve)	≥ 100 kN
Gauge adjustment range	+24 / –28 mm
Gauge block adjustment range	+4 / –8 mm
Gauge-adjusting plate range	±20 mm
Vertical height adjustment	≥ 20 mm

Application

Features and Advantages

Patent-pending umbrella‑skirt structure on the baseplate elastic pad substantially extends creepage distance while dissipating high‑frequency vibrations from the baseplate, thereby enhancing system damping.

Composite rail pad (rubber core + insulating layer) interrupts stray‑current leakage from the rail; its longitudinal overhang design suspends the leakage path, ensuring durable insulation performance under contaminated conditions.

Flanged insulating bushing, together with widened gauge‑adjusting plate, prevents water ingress into baseplate slots during adjustment. The coordinated interface among nylon sleeve, coupling pad, and bushing seals out moisture and debris.

Vertically stacked insulating barriers—gauge block, composite rail pad, and baseplate pad—achieve superior wet‑state insulation and robust contamination resistance.

Footprint and interface dimensions remain interchangeable with existing Type Ⅲ separate fastenings, facilitating direct replacement.

Quality Assurance

Changmei Technology has designed, manufactured, and exported Buried Tram Track Fastening System for over 20 years. Our products are installed on more than 10 tram lines across major Chinese cities like Shenzhen, Wuxi.

Before leaving our factory, Tram rail fastener will be tested strictly according to standard requirements . For customers who require more, we carry out type tests at our in house testing centre.

Custom Mould Design & Manufacturing

– In-House, Start to Finish

Our Mould Engineering Department operates a full digital workshop equipped with more than 20 CNC machines, including machining centres, spark eroders, and wire cutters. This allows us to design and manufacture a wide range of moulds for the rail transit industry – injection moulding, rubber, SMC, and specialised types such as auto-core-pulling bush moulds.

Annual output stands at 500 sets of moulds and tooling.

If your project calls for a non standard shape for Tram Track Fastening System , a special material, or a unique production feature, we have the equipment and the experience to provide you with specific solution.