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Table 2

Calculated magnitudes of BFPF for a high speed train at speeds of 300 km/h.

Ballast Aerodynamic Shape Mass Range (g) (BFPF) Ballast Flying Probability Factor (%)

Without track vibration With track vibration
Flat 0–50 87 97
50–100 51 79
100–150 25 64
150–200 8 58
200–250 20 73
Semi–Spherical 0–50 95 100
50–100 77 96
100–150 56 84
150–200 47 67
200–250 58 74
Spherical 0–50 100 100
50–100 89 98
100–150 72 75
150–200 61 56
200–250 59 45

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