In the comments on the mid-90s WMATA fantasy map, commenter Joseph Henchman pointed me to this compilation of images Zachary Schrag made. In addition to that map, it has this diagram of possible expansion corridors. Not surprisingly, it has much in common with contemporary light rail proposals.

David Alpert created Greater Greater Washington in 2008 and was its executive director until 2020. He formerly worked in tech and has lived in the Boston, San Francisco Bay, and New York metro areas in addition to Washington, DC. He lives with his wife and two children in Dupont Circle.