Pandrol Under Ballast Mats

PANDROL UBM are continuous resilient mats for ballasted tracks designed to provide vibration mitigation while reducing the maintenance and increasing the track quality.

PANDROL UBM is a continuous resilient mat installed directly beneath the ballast bed which may offer vibration isolation and/or protection of the track components during trains passage.

PANDROL UBM are made of high quality resin-bonded rubbers. The elastic properties of the mat solution are defined by the following parameters:

  • Train loading conditions.
  • Chosen material type.
  • Defined thickness and number of layers.
  • Determined shape factor.

When used for vibration attenuation purposes and depending on the above design parameters, PANDROL UBM solutions can typically achieve attenuation levels of 15 to 20 dBv with reduced resonance frequency.

As protection mat, PANDROL UBM improves the load distribution in the track leading to a reduction of the stresses in the ballast and other track components.

Product features by product sector

  • The main features and advantages of the system are:
    • Few components eco-friendly system.
    • Possibility to be supplied in rolls or sheets.
    • Quick and easy installation.
    • Free of closing joints between adjacent mats.
    • Compatible to special track works such as man-holes, pipes and drainage systems.
    • Water permeable.
    • Excellent mechanical and chemical properties.
    • Wide range of stiffness available.
    • Track quality improvement, ballast degradation reduction and increased longevity of the other track components.
    • Savings in track maintenance costs.
    • Protection of track foundation structure (e.g. bridge and viaducts).
    • Contingency solution of track stiffening by sand ingress.
    • Possibility of ballast layer reduction up to 25cm thickness.
    • Easy and reliable solution for build-up of transition zones.
    • Maintenance free.
    • Compliance with international standards for ballasted track systems DIN 45673-5.

    PANDROL UBM, supporting ballasted tracks