What will be the optimum depth of ballast cushion required for a BG ra – McqOptions

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1.	What will be the optimum depth of ballast cushion required for a BG railway track below the sleepers with sleeper density of (M + 5) and bottom width of 22.22 cm?
A.	25 cm
B.	21 cm
C.	28 cm
D.	30 cm
Answer» B. 21 cm

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