Basil Jet wrote:
On 02/02/2020 14:47, Recliner wrote:
One of London's other underground tunnel networks:

https://www.bbc.co.uk/news/av/technology-51315970/inside-the-hidden-power-tunnels-of-london


I presume the rail beneath the roof is for a schwebebahn like they have
in the power tunnel from Elstree to St Johns Wood.


Would not be surprised if some of the footage was taken from the vehicle as
remote controlled inspection by camera is what it has been installed for.

GH