This is some really cool old footage. It shows the 82 streetcar line running from Eckington, heading through northeast, up to Mount Rainier, Hyattsville, Riverdale Park, and College Park.
http://www.youtube.com/watch?v=QpFCFILDOxs
It’s really long, but well worth a watch.
Love the blog! Would love to see if you can find out anything about who lived in what is now Greenbelt Park and when they left or were moved.