hmmmm... this "latching relay" bizzo is something I might investigate further. I could just add them on at a later stage, at the control panel, one for each turnout. Just have the "momentary on" buttons fire the turnout motor, as well as the relay. (hope there's enough "guts" in my CDU to do it). And the 'latching relay" for each turnout would maintain the constant current for the LEDs. hmmm... and could also be adapted for some sort of signalling, too I suppose. hmmmmm..... hmmmmm.... thinks a bit more......... And there's no little smiley thing for **pondering**.