What is "winning headway"

Winning \Win"ning\, n.

1. The act of obtaining something, as in a contest or by competition.

2. The money, etc., gained by success in competition or contest, esp, in gambling; -- usually in the plural.

   Ye seek land and sea for your winnings.
   --Chaucer.

3. (Mining)

   1. A new opening.

   2. The portion of a coal field out for working.

      Winning headway (Mining), an excavation for exploration, in post-and-stall working.

      Winning post, the post, or goal, at the end of a race.