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Re:Exploring the Elizabeth line, one of the world’s largest ... by peteretep on Tuesday May 10, 2016 @08:13AM (#11666626)

    > allows the conductor to take control in the case of a
    > complete (or widespread) signalling failure
Or, having ridden that line as part of a regular commute, whenever the conductor gets bored.
Re:Exploring the Elizabeth line, one of the world’s largest ... by thomaspurchas on Tuesday May 10, 2016 @11:37AM (#11667974)
I don't think they actually get to drive the train then, just get the press the close door button on the panel. The train still drives to the next station without any human input.

Most automatic trains can't be driven by humans under normal circumstances because signaling information is fed to the train far faster than any human could react to it.