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Signaller map
The IMDM line diagram books, page by page: the controlling signaller in each page footer, the lines of route and mileages it covers, and the signals, points, junctions and stations on it. The By signaller view matches WON items against this map.
Drop the IMDM line diagram PDFs here
Line Diagrams Bedford and Line Diagrams Derby. Each book is read in this browser (a 240-page book takes a minute or so); check what was found, then store it. A new issue replaces the old one.