The Pandrol Pangaurd system suspends the rail from the web and fishing surface with resilient blocks. The resilient blocks are held in ductile iron side plates that transfer the vertical load to the tie. The system is in use on MBTA, PATCO and various properties around the world.
Panguard is a unique type of rail fastening. It provides a very low stiffness through rubber wedges which support the web of the rail and prevent excessive rail roll (dynamic gauge widening) which would normally occur on conventional baseplated systems. The nature of the rubber wedge support and the robust design of the assembly provides an ultra low maintenance system with a very long life expectancy in track.
Panguard has a natural frequency of approximately 20-25 Hz which provides the highest level of vibration attenuation that can be achieved in a surface mounted resilient rail support system. For attenuating track forms at lower frequencies the resilience needs to be provided under the concrete slab in the form of floating slab systems, please refer to Pandrol CDM Track for such requirements.
Pandrol Panguard can be installed on all types of construction methods. It can be provided for areas of a new build project where a high level of vibration attenuation has been identified as a requirement. The Pandrol Panguard baseplates provides an exceptionally wide range of adjustment, typically +/-15 mm lateral per baseplate and +30 mm vertical, for more adjustment options please contact us. Because of it’s low profile Pandrol Panguard can give the opportunity to reduce tunnel diameters, and therefore reduce costs for new track construction. Additionally, its low weight can lead to considerable savings in the cost of structures such as viaducts, which would otherwise have to accommodate the greater weight of floating slab-track.
Many railway systems are built on the belief that the performance of the rail fastening system will be adequate for the environmental needs of the surrounding area. Unfortunately modeling the acoustic performance of a railway is not a precise science due to the unpredictable nature of the ground, wheel and rail conditions and whilst environmental impact studies mitigate some of the risk, invariably there can be areas along the line where some vibration/secondary noise can create a public nuisance. The very low profile of Pandrol Panguard compared to other low stiffness track forms means it can be installed within existing restricted rail heights and can therefore be used to increase the vibration isolation properties of an existing track form. That is something that we are doing in many existing railway systems. In fact, at the end of 2014 approximately 50% of all Pandrol Panguard supplies have been installed in existing operating railways.