Railway Engineering
Number of dog spikes normally used per rail seat on curved track is

two outside and one inside
two outside and two inside
one outside and two inside
one on either side

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

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