Extension to Co Op City isn't a far fetched idea for the . It was a proposal from the IND Second System. It also called for the Second Avenue Subway to be extended up Third Avenue in the Bronx and to meet up with the somewhere north of Norwood 205th Street where both the and the planned Second Avenue Subway service would have moved on to Co Op City. Of course it wasn't built due to the Great Depression and the arrival of the automobile, but you get the idea.