Tom Scott: Amazing Places

The world's most useful model railway (2021x16)

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In Darmstadt, Germany, there's the Eisenbahnbetriebsfeld: a model railway connected to actual railway signalling equipment, so that controllers can learn without putting any real trains in danger. I got to learn the very basics. ■ More about the railway (in German): https://www.eisenbahnbetriebsfeld.de/