Crossword Genius

When a train is due: Abbr (3)

Ross

I believe the answer is:

eta

(Other definitions for eta that I've seen before include "indicating when flight is due" , "European separatists, initially" , "Greek letter E; estimated time of arrival (abbr.)" , "giving expected termination of journey" , "Greek letter - time due (abbr)" .)

I've seen this clue in the Newsday.
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