Model railroads.

I also highly recommend Loksound decoders, which is what I believe Rapido uses.

I was a very early adopter of those at a time when SoundTraxx was all the rage and SoundTraxx guys would routinely bash Loksound.

Attitudes have changed in the last couple years as people are figuring out that the motor control and programming options on the Loksoiund are phenomenal. Especially the by default and extremely prototypical prime mover spool up before the loco starts to move.

I tried to duplicate that on the other brands but was never able to, and it's NOT a simple matter of adding momentum as was the typical rebuttal from users of other brands.