Does anyone know where I can obtain a whistle (or more specifically, 2
or possibly 3) that fits the following requirements?

1) Sounds the same as, or very similar to, a tube train whistle
(specifically 38 Stock).
2) Can be modified to run off compressed air at about 30psi or less.
3) Would be small enough to fit somewhere in or on a 7.25" gauge tube
car. (I.e. less than a foot or so in length).

Any help would be appreciated. 3-chime whistles aren't hard to come by,
but ones with the correct sound appear to be.
I can't afford to go for original 38 stock whistles, as there's no way I
could afford it or guarantee being able to get more than one.

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--
Spyke
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