If the flange angle is β, coefficient of friction between flange and rail is μ, the derailment coefficient according to Nadal's formula should not exceed

If the flange angle is β, coefficient of friction between flange and

1.	If the flange angle is β, coefficient of friction between flange and rail is μ, the derailment coefficient according to Nadal's formula should not exceed
A.	[A].
B.	[B].
C.	[C].
D.	[D].
Answer» D. [D].

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If the flange angle is β, coefficient of friction between flange and rail is μ, the derailment coefficient according to Nadal's formula should not exceed

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