I recently acquired one of the tiny Bachmann Davenport locos and fitted RCS battery R/C, batteries and MyLocosound.
The stock Bachmann pcb was removed and a new styrene plate cut to fit using the original internal stanchions and screws to hold it in place.
The ALPHA-3v2 combined RX/ESC sits on the styrene sheet with the LT-SW4 extra sound triggers pcb.
I mounted the new MyLocosound diesel sound under the hood cover for easy access.
The wiring is not as neat as I would normally do.
The 4 x AA size 850 mah battery pack fits just under the styrene sheet.
The ON-OFF switch was mounted under the front of the loco.
All buttoned up with the new RCS TX-21+ handpiece with Inertia control.
Loco is very smooth and steady on the track but on rollers it wobbles terribly. Go figure.