Research Article

Simultaneous Measurements of the Vehicle, Track, and Soil Vibrations at a Surface, Bridge, and Tunnel Railway Line

Figure 17

Linear spectra of the axle-box acceleration of wheel 4 for different train speeds (a) 160, (b) 125, (c) 100, (d) 80, and (e) 63 km/h, while passing the surface track.
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(b)
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(e)