From the WTOP article linked here:
There has been much discussion about the planned Columbia Pike streetcar, but there's another streetcar project in Arlington that's looking more likely to get built sooner than the Pike streetcar.
Arlington and Alexandria are jointly planning a five-mile streetcar line to run from the Pentagon City Metro station, across 12th Street to Crystal Drive, down Crystal Drive to Potomac Yard, and then down Route 1 to the Braddock Road Metro Station.
While DC is still saying that its streetcars will start rolling in 2013 (really?), and Maryland's DC suburban counties are still talking up the Purple Line - but it is still just talk, Northern Virginia keeps claiming that the streetcar is just around the corner. Only this time it is going from Pentagon City to Alexandria. We will see, but as the article states, at least there is funding that can be tapped for this line.
So when is the next car due? 
Parts of the DC streetcar system is under construction , there are some terminus changes which have delayed the opening. The NOVA network is still in planning but gaining traction..... They keep shifting the Purple line , the red line is just about wrapped up and just needs funding.
1) Could someone remind me what the Red Line is in this context? When I think DC and "Red Line", I think the Metro's red line...but while I know that there's some ongoing work there, I didn't remember hearing about an extension or anything like that.
2) I do like the streetcar idea for Arlington/Alexandria. Right now, that part of town is a bit of a mess, transport-wise. Is there any ambition for this to be an actual system, though, rather than just an odd, isolated line?
Anderson,
1) I don't know what the other poster's reference to the Red Line is. It has been completed for quite a while. The only work I know of on the Red Line is repair/rehab work, which is very much needed, as the Red Line was the first Metro line to open (partially) for revenue, and it is showing its age.
2)Arlington County is planning two streetcar lines, which they would like to connect. Here is a link to the
Arlington Co. Govt. Streetcar webpage. The City of Alexandria is currently in the planning process for the future of improved public transportation in the city. There are several different modes of transport being looked at. Here is a link to more information:
Local MotionIMHO:
It would make a whole lot of sense for Arlington and Alexandria to work together on a comprehensive plan for both jurisdictions, as they share a long twisted common border and neither jurisdiction is very large in land mass. Unfortunately it seems that they are both going their own way. While it would make a lot of sense to integrate their systems, so that they are seemless and one would not have to board a different mode of transport at the dividing line, little fifedoms have troubles doing this unless some sort of regional transportation authority, which has real teeth, is agreed upon and set up by the jurisdictions.
One thing about the Crystal City - Potomac Yards streetcar line is that it roughly parallels Metro's Yellow and Blue Lines between Merto's existing Crystal City Sta., the proposed Potomac Yards Sta. and the existing Braddock Rd. Sta., so there is some talk that the line would be redundant, but I think the idea of it is to be a 'local' connection between these stops. With Alexandria balking, I think the usefulness of the line, if it only would serve Arlington Co., is greatly dimminished.