CALMMOON RAIL

Technical characteristics of Calmmoon Rail

Calmmoon Rail merely reduces the noise radiation – and does this prefectly.

Measuring method

The measurements were carried out in accordance with the Austrian standard ÖNORM EN ISO 3095. The measuring points were 1.2 m above the top of rail and 7.5 m from the centre of the track. More than 2,600 rakes of coaches were measured to maximise the reliability of the measured values.

Freight traffic

Where Calmmoon Rail is used on track systems in the ballast bed, the emitted noise in the form of the mean unweighted drive-by spectrum is reduced by up to 11 dB for freight traffic. This is in a frequency range of 500 to 4,000 Hz.

The A-rated drive-by level yielded noise reductions of around 2-4 dB(A) depending on the speed and the wheel roughness.

Railway bridges

The A-rated continuous noise level for 24 hours yielded a reduction of 3.5 dB(A) in the investigation on bridge supporting structures.

Decay Rate^[1]

Calmmoon Rail technology has no impact on the vibration of rails and hence does not affect their "decay" rate either.

Where Calmmoon Rail is used, the quality of the rail running surface is determined only by the rolling stock used.

[1] The decay rate describes the attenuation in rail vibration per linear metre [dB/m] of rail, referred to individual third octave bands. A high decay rate indicates a "good" rail that radiates little noise, whereas a low decay rate indicates a rail with very strong and lengthy vibration that radiates a great deal of noise.