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Description

In case your wondering it’s the very last blast of the whistle Doc gives in this exact scene only it’s doubled up on the soundtrack in today’s episode.

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@RIG  
just like the hydraulic press.wav, poorcat.wav, rewr.wav and so much more…
 
it’s completely dumb, it just take a decent MP3 player with a microphone and record your own samples, but no one is doing it! no one!
brony841

Sierra Railroad #3. Her whistle has been the standard steam locomotive whistle sound effect since before any of us were born. She is also the standard American West locomotive used for most films and television series involving old west trains, including Back to the Future Part 3.
Background Pony #6708
@RIG  
Still a neat coincidence.
 
I mean that’s not exactly the one single train whistle sound effect that exists in the entire universe. There’s…like…a lot of them.