The City Paper reports that Streetcar won't run directly through a tunnel into Union Station. Instead, the trolley would drop passengers off inside the Union Station parking garage (where the Circulator picks up). Basically, Amtrak didn't want to give up the tunnel (Amtrak cited Vincent Gray's aborted attempt to defund the streetcar as evidence that the current mayor is not committed to the streetcar). Running over the bridge will be more expensive and time-consuming to initially set up. Not great news, but not the end of the world either.