Originally Posted by
tj722
madecon is referring to the B30 express MetroBus that goes from Greenbelt Metro to BWI. It's a great option during non-peak hours, but I would take MARC from Union Station since you don't have to deal with traffic issues.
Then I would leave it to madecon to say why "the MARC train from there probably makes the most sense.". madecon, are you suggesting a drive from Bethesda to Greenbelt, then a MARC train to Washington to transfer to another MARC train to BWI??