How do these work ? Roughly I suppose. Robert Rockwell w3syt1 at msn.com<mailto:w3syt1 at msn.com> -- Attached file removed by Ecartis and put at URL below -- -- Type: image/jpeg -- Size: 40k (41642 bytes) -- URL : http://lists.dementia.org/files/pittsburgh-railways/Wire%20crossovers.jpg