I'm in ....I dabbled with it in large scale, several systems were available.
Airwire was a neat dcc based system a little more expensive but most large scalers had less locos than O gaugers!
Battery technology has moved forward creating small and more powerful batteries
You can use smaller and easier to hide audio jacks for charging connections
I used JST plugs on some applications and left them hang loose under rear of tenders
I had r/c and batteries in trailing car and ran JST plugs to loco that way I only needed 1 system for multiple locos
