Figure 9

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Transfer function from surface velocity on each individual node on the rail surface (vertical axis) to the sound pressure in circle with 20 m radius around the rail (horizontal axis), displayed as the relative difference to the largest contribution, in dB. Left to right: 500 Hz, 1000 Hz, 2000 Hz, 4000 Hz, and 7500 Hz. The orientation is identical to Figure 8.
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