Train in the Washington-Baltimore area (4)

I believe the answer is:

marc

(Other definitions for marc that I've seen before include "A brandy; --- Chagall, artist" , "Refuse from grapes after pressing - kind of brandy" , "Sort of brandy made from the remains of pressed grapes" , "Strong liquor" , "Type of brandy" .)

I've seen this clue in The New York Times.

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