With the Digital option of the starter set, the transformer plugs directly into the track, and the control signals come from your phone, so you don't need to buy a controller. The locomotives need a chip each, but that gives them sound (£60 for bluetooth and sound is a very good price) and abc shuttle support, so the double oval you describe could have trains that stop at a station, wait a while then continue. while there are a few other locomotives milling about in sidings.
I have included a picture of the simple layout that I am building at the moment, which still has some track to arrive.
The blue sections denote abc sections that can stop a locomotive, which can then resume in an appropriate direction after an appropriate delay through configuration that is on the locomotive. ABC modules from tramfabriek are around £5 each
I'm thinking at the moment that the 2 ovals would make the trains stop and then continue, whilst the line beside the engine shed would move from a coaling stage to a water tower. With the 3 at the bottom, one could shunt a wagon into a goods shed while the other options are still tbd.