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Baris 48:
* [http://www.signalbox.org/ John Hinson's site 'The Signal Box']
* [http://www.railsigns.co.uk/ Railway Signs and Signals of Great Britain]
* [http://users.cybercity.dk/~ccc29506/rr/signal/dk/dksignal.html Danish Signaling, an introduction] {{Webarchive|url=https://web.archive.org/web/20080113190526/http://users.cybercity.dk/~ccc29506/rr/signal/dk/dksignal.html |date=2008-01-13 }}
* [http://www.davros.org/rail/signalling/articles/junctions.html Clive Feather's Junction Signalling]
* [http://www.siam.co.uk/srs/ Signalling Record Society] {{Webarchive|url=https://web.archive.org/web/20070301141914/http://www.siam.co.uk/srs/ |date=2007-03-01 }}
* [http://www.carreweb.fr/signalisation_en.html French Signalling]
* [http://www.european-railway-signalling-server.net/ The European Railway Signalling Server]