A brief reply to the wireless connection. Some very niece work done here. I just can't justify the time to do this when 2 wires with some slack will get the job done. Any one who has install a sound decoder into an N scale locomotive knows space is at a real premium.
So I will use to wires, has for servicing- I have enough slack to remove the shell, if I need more I just unsolder the wires.
By the sounds of some people they are into the locomotives far more than I.
I have installs that are 5 years in the running and never has to re move the shell.