Rail Fastenings Systems

NABLA Tram

NABLA Tram is a cost-effective fastening system for trams and light rail systems that is comprised of a lightweight plastic baseplate and NABLA Evolution components.

Combining ease of application with high-performance levels, NABLA Tram is compatible with both top-down and bottom-up construction methods, depending on a project’s requirements. The baseplate is designed to allow effective insertion into a dry mix or fresh concrete, thanks to an air evacuation system consisting of blowholes and channels.

The NABLA Tram fastening system is designed for use on state-of-the-art tramway track, conforming with EN Standard 313481-5. Over 250,000 NABLA Tram systems have been installed across Europe.

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Technical Features

  • The plastic baseplate is partially embedded in the concrete to withstand the lateral and longitudinal loading. It is engineered to allow trapped air and water to escape, ensuring a solid fill of concrete under the rail seat.
  • NABLA Tram is a direct fastening system. The rail is attached to the baseplate and the baseplate to the supporting base structure using the same method.
  • The baseplate system has been optimised for automatic machine installation on slip paved fresh concrete. Its shapes, dimensions and weight allow for easy, economical installation.
  • The fastening system comes with a plastic cover designed to prevent concrete contamination, and improve electrical, mechanical and thermal resistance, allowing for road traffic.
  • The NABLA air evacuation system prevents trapped air getting under the baseplate.
  • NABLA Tram provides electrical insulation higher than 20 K ohms (EN13146-5:2012), providing safety from stray currents.

Advantages

  • NABLA Tram has been designed for ease of installation using either bottom-up or top-down construction methods, into either a dry mix or fresh concrete.
  • Covers are compatible with grass, pavement, concrete and bitumen surfaces. They increase the insulation and protect the fastening system from concrete contamination.
  • The baseplate allows trapped air and water to escape, increasing the system’s reliability.
  • NABLA Tram’s GS anchorage provides pull-out resistance of 90kN and higher, allowing a good transfer of loads towards the concrete slab.
  • The system can be adjusted to provide a wide range of stiffnesses (from 35 MN/m up to 150 MN/m) and vibration attenuation better than -10dB.
  • NABLA Tram is suitable for use in conjunction with Pandrol’s QTrack sustainable resilient system for embedded rail.
Rail Fastenings Systems

NABLA Tram

Related Projects

Paris Tram T3b, France

Paris Tram T3b, France

Read the case study

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