The map below is pretty hard to read, so BoogieDowner will list all the stops these two lines make. Most are 20 minutes to Grand Central and 15 minutes to 125th Street.
Harlem Line: Melrose, Tremont, Fordham, Bontanical Garden, Williamsbridge, Woodlawn, and Wakefield.
Hudson LIne: [Yankee Stadium], Morris Heights, University Heights, Marble Hill, Spuyten Duyvil, and Riverdale.
Just a little FYI for people who maybe didn't know how plentiful the transportation options are here in the BoogieDown.