Worm Gear
A gear with slightly slanted or dished teeth to mesh with the worm. In model railroading the worm gear is usually mounted on the driving axle.
Wrecking Crew ...
Lionel universal motors come in two types, spur and worm geared. Worm geared motors will usually be mounted vertically or diagonally and have a corkscrew gear on the armature that mates with a gear with diagonal teeth.
Many locomotives drivelines of the time used an angled motor mount with an attached a worm gear on the end of the motor shaft that meshed with the drive gear. In the Bowser design, the drive worm gear is mounted between two sets of bearings.
Here's the Marx motor - the spring works like a worm gear that turns a geared wheel. Notice that the track is hollow, tubular, and joined by little pins similar to the larger O track.
Slide the screwdriver/blade under the worm gear cover (Worm gear removed from this photo set for clarity).
 See also: Locomotive, Track, Standard, Scale, Tender
  
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