MyLocoSound has light and heavy diesel loco soundcards which can be configured for a whole range of locomotives. They work well with the Piko 35040 radio control. The handset has two function buttons which are usually connected to the horn and the engine start/stop or guard/"All aboard". There is a wiring diagram at
Piko 35040 wiring. Price in the UK is £79 for the soundcard and £9.50 for a small quality speaker which will fit inside easily. No programming is needed. Adjustments to volume, tickover speeds, bell, etc. are all done using a £14 TV remote control.
I would like to suggest the specific soundcard to use so I searched Youtube for a video so that I could match the sounds but I cannot find any video of the actual loco. There is a video of a
BR 212. Does the BR110 sound the same?
Regards
Peter Lucas, MyLocoSound