Turnout Number The ratio of the length of the tangent track to an equal unit of space between the tangent track and a point on the branch track.
U
UDE Undesired Emergency. An emergency that is not initiated by a crew member.
Turnouts (switches) have different numbers (eg. no. 4 turnout and no. 8 turnout). The smaller the turnout number, the smaller the radius that comes off the switch.
Traction models and models in the smallest scales (N and Z) can often get good results with much smaller turnout numbers, down to #2.5 in common usage.
Q. What does the "code" associated with track mean?
Likewise, the narrow gauge turnout off the dual gauge has a yellow target with a red stripe. The true dual gauge turnout has a red target with TWO yellow stripes. Turnout numbers on each target add a bit of scenic interest and help visiting ...
First subway in Canada (1954). Largest light rail system in North America. Turnout Number The ratio of the length of the tangent track to an equal unit of space between the tangent track and a point on the branch track.
 See also: Operation, Track, Curve, Derail, Train
  
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