Sound Modules

I was idly browsing eBay like you do sometimes and while looking for something else stumbled across these pretty cool little modules. They are easily fitted/removed/refitted as there is no wiring and they are motion sensor operated so could go in a tender, carriage, well anywhere you got a bit of space really.

They seem to make both Diesel and Steam versions at least, just thought I'd mention them in case anyone's looking for this sort of thing to fit in PlaRail models