Wildcat
A runaway locomotive.
Wire Tapper
A telegraph operator.
Worm Gear
A gear with slightly slanted teeth which are designed to meash with a "worm." In model railroading, the worm gear is usually mounted on the driving axle.
It was described as being somewhat akin to the same phenomenon that occurs when oil is struck in a wildcat well and the geyser of black gold gushes forth.
Wildcat - A runaway locomotive.
Wing Rail -A continuous running rail that forms the obtuse angle of a diamond crossing. Also a running rail from switch heel towards nose which is then set to form check rail past nose of common crossing.
 See also: Locomotive, Third Rail, Track, Train, Engineer
  
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