a general station reassignment produced by the Federal Radio Commission's General Order 40, WJZ moved to 760 kHz. On March 24, 1932, WJZ claimed to be the first radio station to broadcast a program from aboard a moving train; the station aired a variety show produced aboard a Baltimore and Ohio Railroad passenger train travelling through Maryland. In November 1933, WJZ, WEAF plus the NBC and RCA corporate headquarters moved to 30 Rockefeller Plaza. In March 1941, under the provisions of the North American Regional Broadcasting Agreement, stations assigned to 760 kHz were shifted to 770 kHz, with WJZ designated as a Class I-A clear-channel station, thus the only station allowed to operate at night on this frequency. However, the following November the Federal Communications Commission (FCC) moved KOB in Albuquerque, New Mexico, which prior to the 1941 reassignment had also been a clear channel station, from 1030 kHz to 770 kHz, after it was found that there was too much nighttime interference between it and WBZ in Boston on their shared frequency. WJZ soon complained about the interference KOB was causing to its distant nighttime coverage, starting a dispute that would last for 38 years. In 1958 the FCC attempted to rectify the matter by designating the now-WABC and KOB as co-equal occupants of 770 kHz, with both stations required to protect each other's coverage as "Class I-B" stations. WABC appealed this decision, and through a series of legal battles was ultimately successful in maintaining its status as an unrestricted Class I-A station. In 1976 the FCC designated KOB as a Class II-A, station, requiring it to operate with a directional antenna at night to protect WABC's coverage. KOB unsuccessful appealed this on the grounds that it should have been assigned the frequency's Class I-A assignment, and the case was finally settled in 1980, with the courts siding with the FCC decision. However, that same year as part of a general review of clear channel operations, the FCC also reduced nighttime protected coverage for clear channel stations from unlimited to 750 miles (1,207 km) from their transmitters, opening up the band to nighttime operation by additional distant stations. WJZ and the Blue Network presented many of America's most popular programs, such as Lowell Thomas and the News, Amos 'n' Andy, Little Orphan Annie, America's Town Meeting of the Air, and Death Valley Days. Each midday, The National Farm and