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If D is the distance between parallel tracks G is the gauge and α is angle of crossings, the distance between theoretical noses of two crossings measured parallel to tracks, is

(D - G - G sec α) cot α
(D - G + G sec α) cot α
(D - G - G sec α) tan α
(D + G + G sec α) cot α

Correct Answer: (D - G - G sec α) cot α

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