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Correct Answer : 90°
Explanation : A railway line should always cross a road at 90° angle, i.e. they should be perpendicular to each other. This is done so that the passing train is clearly visible to the road passengers, thus avoiding accidents.
Correct Answer : Option (D) : All of the above
Correct Answer : Option (A) : turnout
Correct Answer : Option (C) : 30 to 35 cm