I should add since we have had questions about railway signalling systems, here is a very useful website. The gray band at the top provides the menu to access various pages of the website.
Jonroma.net
Here is a video showing how signallers (Dispatchers) are trained at Därmstadt Technical University. In Germany training operating personnel, including mangers, is taken seriously. No making college graduates with a BA in English Lit, and an MBA into Trainmasters.
The World's most useful Model Railway
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