This story starts a long time ago, when I was a nipper. My first memory of seeing a Searchlight signal was when the 141's were new, and we had gone to Huddersfield to visit an elderly aunt. We had a day trip out to Leeds, and there, sat on a gantry were a pair of Searchlight signals. The fact that more than one colour came out of the one 'hole' really got me interested in how they worked. I found a drawing in a book that showed a moving vane holding the coloured lenses, but at that young age I c