Thanks for both comprehensive replies. My main issue is incredibly tight space which thse 2x X404 will solve. I have 2x them working on a DC (dont ask - it's an evolution) part of my layout however they are fed by a CDU unit and conseqently, as you imply, work correctly. Your confirmation on this has no led me to looking to source a DCC Concepts decoder with built in CDU. I can then move onto powering up the Fleischmann turnouts on my German DCC section but having gone through this will use a dedicated power supply into the ESU SP's. Thanks again