Fox is a relative newcomer that began operation on October 6, 1986 with a limited schedule of late-night programming (the network would launch a weekend-only prime time lineup seven months later on April 9, 1987), although it is built upon the remnants of the former DuMont Television Network, an earlier attempt at a "fourth network" that operated from January 1948 to August 1956; the Paramount Television Network also flourished simultaneously, if less successfully.