My vacation in London started with a what some would call a nerd tour. I took a Hidden London tour through London Transport Museum. The tour was of Charing Cross station and included an abandoned platform, where the Jubilee Line used to stop, and also ventilation tunnels. The Jubilee Line platform was abandoned in 1999 when the line’s extension was put into operation, and the line needed rerouting for the extension. The platform is now used for testing station features and also frequently for filming. The tracks are still used to store trains or turn them around. The tour also included accessing ventilation tunnels and viewing the ventilation shafts that allow air from the subway tunnels to escape to the outside. We also got to look down a shaft to the subway tunnel below. The ventilation shafts are massive but needed to allow air to flow through the tunnels. Finally we also got to go under Trafalgar Square via a construction tunnel that was built to bring supplies to the tunnel work and remove spoils from the tunneling.
Interesting, Thanks for sharing.