Editing Subterranean London (section)

==Abandoned structures==
Some underground structures are no longer in use. These include:

* The [[London Hydraulic Power Company]], set up in 1883, installed a [[hydraulic power network]] of high-pressure cast-iron water mains. These were bought by [[Mercury Communications]] for use as telecommunications ducts.
* Sections of the [[London Pneumatic Despatch Company]] tunnels linking the General Post Office and [[Euston Railway station]].
* An extensive private underground railway, the [[London Post Office Railway]], was constructed by the [[Post Office]], fell into disuse and has now become a tourist attraction.
* [[Closed London Underground stations]] are generally not accessible to the public except on [[London Transport Museum]] guided tours.