Superior Train
A train having precedence over another train.
Surface Transportation Board ...
If the inferior train by direction was a first class train and the superior train was a second class train, ...
This rule makes sure that a superior train following an inferior train is not held up unnecessarily. Therefore in ABS territory, the train must be so far in advance to avoid a restrictive signal to the superior train following.
SUNA Initials of Switchmens Union of North America Superior Train A train having precedence over another train.
 See also: Station, Track, Train, Turnout, Switch
  
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