My 326 Hudson was purchased used at a train meet over 35 years ago and the air chime whistle was absent when I purchased it. Given that the reverse unit has been replaced and rewired twice and the armature had been rewound, the smoke unit has been rebuilt, and the paint has been touched up, I figure that it's collectible value is nil, so I chose to upgrade it with one of the new Dallee "Postage Stamp" steam sound units that provide a whistle and a bell.
Doug Peck sent me the unit and it was "easy peasy" to set up for running on AC, just wire the unit to the front and rear trucks in the tender, plug in an 8 ohm speaker and program which whistle or bell you desire However it will work with DC, DCC or even Radio control Here is a link to the instruction sheet https://www.dallee.com/PDFs/Hi...eam-Instructions.pdf
It really is a great upgrade and is just plain easy to do, so if you just hate the sound of the "Air Chime Whistle" ( see https://www.youtube.com/watch?v=jUWCebaeSCc ) or you want to add a whistle and bell to a locomotive that came without them, give this a try.
LittleTommy