Green Acres was a spin-off from Petticoat Junction.

I think there was a cross-over when Lester Flatt and Ernie Scruggs visited Petticoat Junction and talked of the Beverley Hillbillies.

Scruggs and Flatt did the Beverley Hillbilly theme (the Ballad of Jed Clampett) as well as "Duelling Banjos".

Come ride a little train that is going down the track
To the Junction,
Petticoat Junction.

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Calm, quiet, smooth, devastating