Table 2.

Sensor installation at different rail joints.

Serial Number	Name	Serial Number	Installation Location	Testing Direction	Running Speed	Sampling Frequency
1	DH131E	①	Weld step	Vertical	1 m/s, 2 m/s	10 kHz
2	DH131E	②	Weld step	Axial	1 m/s, 2 m/s	10 kHz
3	DH131E	③	Relatively flat	Axial	1 m/s, 2 m/s	10 kHz
4	DH131E	④	Larger weld	Axial	1 m/s, 2 m/s	10 kHz
5	AC133-1D	⑤	Relatively flat	Vertical	1 m/s, 2 m/s	10 kHz
6	AC133-1D	⑥	Larger weld	Vertical	1 m/s, 2 m/s	10 kHz