Hi Arthur
Thanks for your reply on the 'insulated rail'. A good how to for making one.
I've tried it and after my un-handy work the revised track never gets back the way I had it before I removed it. I thought of removing a track and replacing it with a true insulated rail, but there is the issue of location. The area where I want to do this has some long stretching and placing the IR next to the tracks with relays under the table top is most convenient for me than working on the tracks proper.
Ralph