In 1947 the "Bulletin" bought out its evening competitor, "The Philadelphia Record", and incorporated features of the "Record"s Sunday edition into the new "Sunday Bulletin". By 1947 the "Bulletin" was the nation's biggest evening daily, with 761,000 readers. Along with the "Record", it also acquired the rights to buy Philadelphia's third-oldest radio station, WCAU. In a complex deal, the "Bulletin" sold off WPEN and WCAU's FM sister, changed WPEN-FM's call letters to WCAU-FM, and the calls for its under-construction television station to WCAU-TV. The WCAU stations were sold to CBS in 1957.