Well – this topic is not an easy one…. You may run analoge, which is the cheapest, but nor very comfortable, because you are binded to a fixed place in the garden. Running digital (DCC) is able to run the trains seperated. This solution is pretty expensive and starts at round about 800€, which is a no-go for me.

Googleing a little, I found DelTang, a british on-man-company, building extremly small RC transmitters and receivers for model cars, boats and trains….. This sounds like a nice perspective…