The 'voice' of the channel is Lou Brutus, who models his announcing style after that of Bing Crosby staff announcer, Ken Carpenter. Both have since departed, and the channel is currently programmed by Human Numan. The original 'Station Master' (Program Director) for the channel was Marlin Taylor, with Bob Moke serving as music director. The name also lends reference to the popular dance hall in Harlem during 1940s called The Savoy Ballroom, where the Lindy Hop and 'Jitterbug' dancing was born. The 40 s Junction name, and the station's longtime nickname, 'The Savoy Express', refer to the passenger train−travel common in the 1940s. The station was rebranded as 40 s Junction on August 13, 2015. 71, the station was known simply as ' 40 s. It was later rechanneled to be nearer to stations featuring similar genres of music, such as jazz and standards. Until May 7, 2015, the station was known as ' 40 s on 4, with programming being broadcast on channel 4, as part of the 'Decades' line-up of stations. The channel mainly airs big band, swing, and hit parade music from 1936 to 1949, with occasional songs from the early-1950s.

' 40 s Junction is a commercial-free music channel on the Sirius XM Radio platform, broadcasting on channel 71 as well as Dish Network channel 6071.

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