Links & References

Signalling Links

Deutsche Eisenbahnsignale bei Blocksignal und auf der Site von Christoph Schmitz
Signalisation ferroviaire allemande (en français)
Principles of German railway operations on the excellent web site of Prof. Dr. Joern Pachl.
Handbuch für Siemens-Spurplanstellwerk SpDrS60
Thomas Nosske's site on Epoch II, also with signalling information (German)
Links to a large number of signalling and railway web sites at The Signalpage
Informationen über Signale für Modellbahner: DER-MOBA
The (British) Signal Box with an extensive page on further signalling links
The British Organisation on Railway Safety: Her Majesty's Railway Inspectorate
Austrian Signal Boxes (German, by H. M. Müller)
German and Austrian signalling by J. B. Calvert
French signalling (in French)
Danish Signals
Hungarian Signals
Norwegische Eisenbahnsignale (German)
U.S. Railway Signals
US Searchlight, Tri-Colour, and Position Light Signals by Mark Vogel
Roland Smiderkal's site on Austrian and Swiss Signals
Indian Signalling
Chilean Signals Señales Chilenos
Chinese Railway Signals by Hans Schäfer
The Feldbahn Site Really excellent signal drawings
Henning Makholms Site: More Signalling Links
Navesti Ceskych Czech Signals
Swedish Signals at:
    The excellent site Signalfakta by Per Forsström (Swedish)
    http://www.ettnet.se/~tw/nynas/signal.html
Dutch Signals
Berliner U-Bahn-Signale at Berliner U-Bahn (German)

Railway and Railfan Links

Germany
Deutsche Bahn AG
Hamburger Hochbahn AG
German Road Regulations and lots of information about driving in Germany (by the Texas Highwayman)
The "Molli" a narrow-gauge steam railway in Mecklenburg (German)
John Oxlade's excellent World Railfans Site with lots of information on German and other Railways, including a discussion forum that will answer all your questions.
Taigatrommelpage - about the "Taiga Drum" locos
Europe
A Railfan's Guide To Copenhagen about Copenhagen Public Transport
Fédération des Amis des Chemins de fer Secondaires French branch railways(in Français, English, Deutsch)
Mid Norfolk Railway

Eurasia

OSShD (Организация Сотрудничества Железных Дорог) - Organisation for the Combined Operations of Railways

North America
Ottawa Public Transport (OC Transpo)
Railserve Links to many railway related sites
RailFan Web Site A directory of many US railfan sites

Other
Peter Wiegel's Site, also containing fonts used at Prussian and German railways
Australian Rail Server
Chinese Railways
Malaysian Railways

Commercial Web Sites
Micro Macro Mundo (USA importer of European model railway items)
Ostmodell (model maker of East European items)

References