Latest from Transport for London:
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All privately-owned e-scooters and e-unicycles, including those that can be folded or carried, will be banned on London’s transport network from Monday 13 December. This is the result of safety concerns about these items following recent fires on TfL premises & services.
Customers in possession of such devices will not be permitted to enter any premises on TfL’s network or travel on any of its services, including on the Tube, buses, Overground, TfL Rail, Trams and DLR.
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Not sure what the import of the "privately owned" is. Does this mean that hire ones are exempt?
Note that it includes trains which TFL has control of, not just underground stuff.
Be intereresting to see if other train companies follow suit. In some bits of the country there are trains which go through tunnels far longer and deeper than any TFL trains.