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Noise reduction in Railway Traffics
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Noise reduction in Railway Traffics

• Problem
• Wheel squealing when travelling through curves
• high-frequent, disturbing noises
• Noise problem for the neighborhood
• high costs for noise preventing measures

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• Reasons
• different distances for outer and inner wheel in
  curves
• differential slip
• torsion of the axles
• Stick-slip-Effects, normally on the low rail

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• Remedy
• steered wheel sets better adaptation of the
  axles to the curve radius
• Disadvantage high costs, reduces only wheel
  flange wear

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• Remedy
• Rail Head Treatment with intermediate agents

TRAM-SILENCE TRAM-SILENCE 00
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• Remedy
• TRAM-SILENCE is applied manually onto the rail
  head
• Consumption as low as possible
• Application on the low rail is normally
  sufficient
• Beginning some meters before the curve starts
• End normally some meters behind the starting
  point of the curve
• Bidirectional traffic Application from the
  center of the curve in both directions

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• Remedy
• Recently, we had a lot of inquiries for a product
  which can be applied automatically
• This can be done with TRAM-SILENCE at normal
  temperatures, e.g. with REBS-lubricators
• TRAM-SILENCE is not sprayable at low temperaturs
• Therefore Modification TRAM-SILENCE 00

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Composition TRAM-SILENCE TRAM-SILENCE 00 Base
oil native synthetic Thickener Ca-Seife inorga
nic Solids Metal powder, Graphite

• Properties
• First results of spray tests with TRAM-SILENCE
  00 Sprayability down to -20C possible
• BEKA Fluilub
• Vogel SP 9
• REBS (-15C)

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Customers

• several local tramway operators in Germany
• Jena, Frankfurt/Oder, Leipzig, Gera, Dresden
  etc.
• Deutsche Bahn AG (pre-trials)
• Dutch Railway NS (Practical trial)
• Spanish Railway RENFE and some local operators
• several Australian operators
• Several swiss operators

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Customers
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Consumption rates and results

• Consumption rate is dependent from local
  conditions e.g. Curve radius, Rail- and Wheel
  condition, Weather etc.
• Slogan as much as necessary, as few as possible
• Braking, traction and signalling must not be
  affected
• Friction coefficient with TRAM-SILENCE is not
  worse than on wet rails
• Rough estimation of consumption
• ca. 0,1 g/m on the low rail

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Future aspects

• Demand for these products will increase because
  the problem awareness is increasing
• Application changes over more and more to
  automatic lubricators
• We shoul actively discuss these problems with our
  customers. Their problems are waiting for
  solutions.
• We should not talk about Rail Head Lubrication,
  but about Rail Head Treatment.
• There is a huge potential for these products.

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Noise reduction in Railway Traffics