You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For consistency, answers should be in all lower cased letters.

Q: Category: APPROBATION 
Clue: Japanese consul Chiune Sugihara, who saved hundreds of Jews in WWII, bears the title "Righteous" this

A: gentile
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Q: Category: LARGE EQUIPMENT 
Clue: For smooth travel, ballast tampers & ballast regulators keep the gravel at the right level among these

A: railroad tracks
****
Q: Category: YOU, ME & DUE PROCESS 
Clue: In 1970 the Supreme Court held for the first time that due process required proof of guilt "beyond" this

A:
reasonable doubt
****