A television show that ran on the USA Network during the 1980s. It was basically a collection of mostly unrelated mediocre Hanna-Barbera cartoons from the 1960s and 1970s. The various cartoons were linked together by some slapdash animation of a bullet train holding cartoon characters featured on the show. Presumably a very cheap way for the USA Network to fill late afternoon air time.
If you grew up in the 1980s and you have any memory of Space Ghost before Cartoon Network came out with Space Ghost Coast to Coast this is probably where that comes from.
Also featured such animation non-classics as:
The rights fees for good Hanna-Barbera toons such as Scooby-Doo, The Jetsons, and The Flintstones were obviously too high for USA.
There were probably many other cartoons that I've forgotten.../msg me if you remember more.