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Reply to "Ac to Dc Buck Converter Voltage Question"

Yes.  Presumably your train transformer has a 14V AC Accessory output.  Or 18V AC fixed output from a brick is fine too.

Your module says 2.5 Amps output max.  2.5 Amps at 9V DC is 22 Watts.  I'd guess a sound module from a boxcar might be rated at 1 or 2 Watts max.  So should be no problem driving two (or more).

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