Railway Engineering
Consider the following surveys.1. Reconnaissance survey2. Preliminary survey3. Traffic survey4. Location surveyThe correct sequence in which these surveys are conducted before the alignment of a track is finalised is

3,1,4,2
3,1,2,4
1,3,4,2
1,3,2,4

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Railway Engineering
Lead of crossing is the distance from the

heel of the switch to the theoretical nose of the crossing
toe of the switch to the actual nose of crossing
toe of the switch to the theoretical nose of crossing
heel of the switch to the toe of the switch

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