Argosy University-Washington D.C. to Poughkeepsie, NY buses and trains from $43

Here are some trips other travelers have found on Routefriend.
$43
8h 1m
1 stop
Vamoose Metro-North
$45
7h 28m
1 stop
Vamoose Amtrak
$48
7h 33m
1 stop
GotoBus Metro-North
$50
7h 33m
1 stop
GotoBus Metro-North