In addition to the "<5>", "<6>", and "<7>", official maps and schedules used to show several other rush-hour only services with a diamond, including the "<4>" bypassing 138th Street, "" to Rockaway Park, "" and "<C>" to Bedford Park Boulevard, "<D>" express on the IND Concourse Line, and the "<M>" to Bay Parkway. In May 2004, the map was changed to show only the diamond "<6>" and "<7>". The diamond symbol usage has thus been redefined to indicate a variant rush-hour express service running simultaneously with a local service in the same direction.