Endicott College to Catholic University of America buses and trains from $35

Here are some trips other travelers have found on Routefriend.
$35
8h 58m
1 stop
Greyhound GotoBus
$76
6h 30m
0 stops
Amtrak
$102
7h 34m
1 stop
Greyhound Amtrak
$157
6h 30m
1 stop
Amtrak Amtrak