I've heard it and read it time and time again, "The commute from Baltimore to DC on the MARC train is a piece of cake". I only know one person who actually takes MARC daily, he's a big fan and says the commute is as easy as pie.
I figure the proof is in the pudding: Catrin Davies of Passport Realty in Baltimore's Mt. Vernon neighborhood thought so, too.
Looks like all the commuter-types aren't full of beans after all. The trip's like taking candy from a baby. Doesn't look like people are packed in like sardines, either.