Eleven Metro stations will get official nicknames by next summer under a new Metro policy to shorten the unwieldy names. The transit agency will use a concise primary name for those stations, putting the rest of the existing name underneath as a secondary name. So the system’s longest name, U Street/African-Amer Civil War Memorial/Cardozo, will become U Street, with African-Amer Civil War Memorial/Cardozo treated as the secondary name.