You should add more information regarding the rapid transit system because not everyone, especially DTG is going to know what is WMATA (Washington Metropolitan Area Transit Authority). I know what that is as I like rapid transit system from the U.S. and around the world but not everyone is familiar with other mass transit. There are 6 lines with various lengths and rolling stock. Suggestions Show the map of the system What line you prefer? How long is it? what rolling stock does the line use? What yard does the line use?