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Question

# A BG railway track is designed for an equilibrium speed of 80 kmph and maximum speed as 100 kmph. If the radius of the curve is 875 m, then the super elevation to be provided is

A
171.50 mm
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B
150.82 mm
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C
75.82 mm
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D
96.5 mm
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Solution

## The correct option is D 96.5 mmRadius of the curve = 875m Super elevation for equilibrium speed =GV2127R=1676×802127×875=96.52 mm Suoer elevation for maximum speed =GV2127R=1676×1002127×875=150.82 mm Cant deficiency = 150.82 - 96.52 = 54.30mm Maximum permissible cant deficiency for BG track = 75 mm > 54.03 mm Hence, Provide super elevation of 96.52 mm

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