Originally Posted by Mistered

Speed and fare are unknowns, and the station will be shuttle or healthy underground walk away (with bags). Metro has shorter hours and longer waits on weekends and every Monday holiday (when govt. is closed but most of the private sector isn't). These three-day weekends are among the busiest travel days.

A close-at-midnight system won't work well for 24x7 IAD employees. For local pax, no overnight parking at the Metro stations. This is all a show, and a costly one. It will look great in the brochures, though.