I already found the "operating instructions" online ("9152c Drehscheibe")http://www.modelbanen.eu/Manualer/web/Fleischmann%20drejeskive%20manual.PDF
These instructions have good diagrams and english translation at the back.
But the info related to the operating voltages/currents seems unclear.
As poliss mentions, power maybe an issue if you are feeding several circuits including the actual track from the same transformer.
But to buy an extra transformer is not cheap. I know Fleischmann have a power booster unit which you can buy but I am not sure what this then gives you in terms of total power.
I've heard about these power buses which people seem to use in their layouts to place feeds every few feet around different parts of the layout or track, but I guess this would even need a power booster if the load is too high? I guess I'll find out as I go along...
Oldman, what do you mean by "FOC"?