Dieselpunk is a retrofuturistic subgenre of science fiction similar to steampunk or cyberpunk that combines the aesthetics of the diesel-based technology of the interwar period through to the 1950s with retro-futuristic technology and postmodern sensibilities. Wikipedia

Science fiction genre Wikidata

A postmodern genre of art as well as a budding subculture that combines the aesthetics of the interbellum period through World War II and ending circa 1950s (a range of time often referred to as the “diesel era” by the dieselpunk community) with contemporary creations. Wiktionary