Rail Fastenings Systems

ADH System (Bonded DFF)


Limit corrugation and vibration problems caused by the major dynamic forces generated by passing trains with the Pandrol ADH System (Bonded DFF). This versatile fastening solution is suitable for use on slab tracks, concrete sleepers, steel bridges, ballasted tracks, turnouts and crossings.

Pandrol ADH System explained

The ADH System provides both vertical and lateral stiffness via two independent cast baseplates. A one-piece bonded system (comprised of a top and bottom plate) is factory-assembled by bonding with vulcanised rubber. This provides high levels of electrical resistance, a long electrical leakage path, and lateral resilience.

This versatile system can be used on both standard track and turnouts. A single fastening system can be used for the whole track system as the standard model is designed for running track and customised models are designed for switching zones.

  • Suitable for top-down and bottom-up construction
  • Provides exceptional vibration mitigation
  • Delivers both vertical and lateral stiffness via two independent cast baseplates

Advantages of the ADH System (Bonded DFF)


High corrosion resistance

Protect the baseplate from atmospheric corrosion and wear thanks to the ADH System’s rubber coating, which acts as the perfect protective barrier, extending the lifespan of the product.


Vibration isolation

Keep vibrations and noise generated by wheels on the track low, with the ADH System’s low stiffness. This decreases the dynamic load level by distributing vibrations along the supports, rather than into the ground.


Electrical safety

Achieve a high level of stray current protection thanks to the DFF assembly’s failsafe designed, optimised to remain active and safe in situations where bond failure between rubber and metal components occurs.


Simply installation

Install the ADH System (DFF) simply and quickly. The system, or any of its components can be installed or replaced by a single person using hand tools for efficiency. Despite this ease of installation, the system provides good track elasticity and reduced rail stress.

Technical features of the ADH System (Bonded DFF)


Variable baseplate options

Choose from the ADH System’s two and four-hole offset and two-hole line footprint configurations to suit your application. This adaptability provides the best solutions for new build, track renewal and retrofit projects.


Variable rail fastening

Wave goodbye to worries about rail specifications – the ADH System (Bonded DFF) is available with a variety of clip types, including eClip, SD, SLK, NABLA, and FE rail fastenings to suit every specification requirement.


Electrical insulation

Achieve high levels of electrical resistance and long electrical leakage paths with the SDH System’s unique bonding process. Tests against EN Standards have shown electrical insulation performance several times higher than the minimum required.


Turnout options

Choose from a variety of lengths, with different base plate lengths and options to suit all turnout applications. The Pandrol ADH System (Bonded DFF) is also suitable for steel bridges and ballasted tracks.


Track-structure interaction

Select low-toe load rail fastening clips and zero longitudinal restraint (ZLR) configurations to make the ADH System ideal for use on bridges and viaducts. This ensures the effects of track-structure interaction are considered and mitigated appropriately.

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