Is there a sound module available for the 28657 4-6-0 loco, and does it plug in or require wiring?
Some 4-6-0s were made with factory-installed sound, but the parts store is sold out of the individual boards.
The non-sound tenders for these locos have a speaker cutout and an 8-pin socket for DCC decoders.
You can purchase a 3rd party DCC sound decoder, but will need to supply your own speaker.