Thanks Andy, I had a feeling that may be the case, will check my power supplies before I plug two in, not sure I fully appreciate what I've got yet in regards to track, a friend at work has just given me his Le Mans set to go with the Bash'n'Crash, GT Interactive + RMS (4) and Rally Sport (3) + lots of additional track I bought from fleabay - me thinks I'll be moving into the loft!! This is the first forum I've actually participated in and the experience has been really positive, thanks once again to Andy P for the quick reply - where do I get plug in dimmers from? Are they available from Hornby, or an after market modification? Next step is digital!! Regards Max58