Adding sound to a Rail Truck?

[Flare]

I'd like to add sound to my On30 rail truck without changing the stock appearance.

Does anyone have experience doing this?


I see that SoundTraxx's TSU-1100 looks small enough to fit in the decoder box, and version 885004 comes with the Galloping Goose #5 engine and 'awooga' horn files, but if I go that route which speaker should I use and will I need any other accessories like the speaker gasket or can I simply mount the speaker in the box if it will fit?

(I've never added sound to a loco before.)

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The TSU 1100 will fit in the mail box.  A 1/2" speaker will fit in the cab, but a sugar cube speaker might give better sound.  A tiny Keep alive could also be squeezed in the cab.