In reference to the previous line, Heems may (in addition) be referencing a Lionel train going around the tracks.
He says Lion-O like from Thundercats, not Lionel. Das Racist has a lot of cartoon references in their lyrics and their name comes from Wonder Showzen which was a animated sketch comedy show using stock footage. In a sketch a little kid goes “THAT"S RACIST” and that is where their name comes from.
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