I think if were traveling from Baltimore to DC by train I would just take the Amtrak as it doesn't stop every 5 minutes. I guess this might help people living in Laurel or Arbutus or something but not really Baltimore. I will have to say MARC trains blow. They are joke. The freight trains have preference on the line so if a frieght train is coming you might have to sit waiting for 10 to 15 minutes while it pulls by.