The Roller Derby Coalition of Leagues (RDCL) was founded in the fall of 2011 by 5 banked track roller derby leagues that saw a need for support in the modern banked track roller derby community. Arizona Derby Dames, Los Angeles Derby Dolls, OC Roller Girls, San Diego Derby Dolls, and Tilted Thunder Railbirds came together to help promote and grow the sport of women’s banked track roller derby..