The line Pardon me, Roy, ?!

Question: The line Pardon me, Roy, !?

is that the catatonic choo-choo, where does it come from!?
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Answers:

Do you mean the Chattanooga Choo choo!? It was a swing song which was featured in the 1941 movie Sun Valley Serenade!.Www@Enter-QA@Com

Don't you mean:
Pardon me boy, is that the Chatanooga Choo Choo!?

Or is that some sort of parody!?Www@Enter-QA@Com

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