An unusual model, Heljan's Metropolitan Bo-Bo is quite simple to upgrade to DCC Sound.
An MS440D decoder plugs in nice and simple, and there is space in the roof for a dual SugarCube24x15x09 speaker. The sample
1000uF capacitor that comes with the MS440 also fits in no problem at the opposite end.
We wire the speaker direct to the decoder to avoid having to use the socket that Heljan put on their PCB (and don't provide a
BlackTack to hold the speaker and capacitor in position in the roof.
Another example, same kit...
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steps detailed here.