This is a rare sound effect that can not be found on any (already known) sound effects library, and it is going to be placed in the Unknown Sound Effects Library. The horn heard was said to be from Canadian Pacific #9726's Nathan P3 airhorn.
Used in
Movies
- Lemony Snicket's A Series of Unfortunate Events (2004) (used as the PRR T1’s whistle.)
- The Addams Family (1991)
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