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noise reduction of electrically powered tamping units

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noise level in idle mode, electrically powered tamping unit

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maximum noise level, battery-powered catenary installation machine

The railway system is handling increased passenger and freight volumes, which is why maintenance work increasingly has to be carried out at night. As a result, the issue of noise emissions from machines is becoming more important.

electric = efficient = quiet

When it comes to noise reduction, Plasser & Theurer's E³ machines score highly thanks to their focus on electric drives and power packs. This increases efficiency, reduces CO₂ emissions, and the machines also work much more quietly.

When measured on a Unimat 09/4S E³, for example, the electric power wagon is 13 dB(A) quieter than a comparable diesel-hydraulic wagon. The electrically powered tamping unit is quieter by 20 dB(A), with only 62 dB(A) measured in idle mode, which corresponds to the volume of a conversation in an office.

Low noise levels: no hearing protection required

The first battery-powered HTW 100 E³ catenary installation machine was already quieter by 20 dB(A) than its diesel-electric counterpart, and it never exceeded the 80 dB(A) in working mode, above which hearing protection is required by law.

The Plasser CatenaryCrafter and MultiCrafter are particularly quiet: running and working is emission-free and power is supplied via the overhead contact line and battery.


Significant, measurable noise reduction thanks to more electric actuators.

All-electric tamping is significantly quieter (a Unimat 09-8x4/4S BR-Dynamic E³, Austria is shown here)

Construction and maintenance are increasingly taking place at night due to the heavy use of the railway system

In densely populated areas, residents also benefit

Quiet and emission-free working offers particular advantages in tunnels

Quieter tamping units thanks to frequency control with hydraulic design