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The London Underground (also known simply as the Underground, or by its nickname the Tube) is a rapid transit system serving Greater London and some parts of the adjacent counties of Buckinghamshire, Essex and Hertfordshire in the United Kingdom.The Underground has its origins in the Metropolitan Railway, the world's first underground passenger railway. Opened in January 1863, it is now part of the Circle, Hammersmith & City and Metropolitan lines. The first line to operate underground electric traction trains, the City & South London Railway in 1890, is now part of the Northern line. The network has expanded to 11 lines, and in 2020/21 was used for 296 million passenger journeys, making it the world's 12th busiest metro system. The 11 lines collectively handle up to 5 million passenger journeys a day and serve 272 stations.The system's first tunnels were built just below the ground, using the cut-and-cover method; later, smaller, roughly circular tunnels—which gave rise to its nickname, the Tube—were dug through at a deeper level. The system has 272 stations and 250 miles (400 km) of track. Despite its name, only 45% of the system is under the ground: much of the network in the outer environs of London is on the surface. In addition, the Underground does not cover most southern parts of Greater London, and there are only 31 stations south of the River Thames.The early tube lines, originally owned by several private companies, were brought together under the "UndergrounD" brand in the early 20th century, and eventually merged along with the sub-surface lines and bus services in 1933 to form London Transport under the control of the London Passenger Transport Board (LPTB). The current operator, London Underground Limited (LUL), is a wholly owned subsidiary of Transport for London (TfL), the statutory corporation responsible for the transport network in London. As of 2015, 92% of operational expenditure is covered by passenger fares. The Travelcard ticket was introduced in 1983 and Oyster card, a contactless ticketing system, in 2003. Contactless bank card payments were introduced in 2014, the first public transport system in the world to do so.The LPTB commissioned many new station buildings, posters and public artworks in a modernist style. The schematic Tube map, designed by Harry Beck in 1931, was voted a national design icon in 2006 and now includes other TfL transport systems such as the Docklands Light Railway, London Overground, TfL Rail, and Tramlink. Other famous London Underground branding includes the roundel and the Johnston typeface, created by Edward Johnston in 1916.

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  1. M

    UK 6

    I wish to add a second boiler to my existing meter. Location 20m away. Underground run. Can l use 32mm yellow pipe with copper tails at each end. Thank you in advance
  2. L

    Underground oil tank feed problem

    This unit is located in France where they use diesel not kerosene. The feed from the underground tank is not getting through to the boiler. The boiler works fine if I connect the hoses up to a remote tank of diesel. I am assuming that a filter is blocked somewhere but there is nothing between...
  3. I

    Underground hot water feed pipe.

    I've had a burst pipe under bathroom floor. Ive had it dug up and made safe with the affected pipe cut and end caps fitted. The pipes are cover with a plastic sheet and then screet on top. I called out my gas boiler cover to make a permanent repair. The company they sent out have said it is...
  4. I

    Underground water leak

    Heĺlo I have a water leak under bathroom floor tiles. It is on the hot water feed to the tap. I noticed the tiles leading to sink warm last few days. Now my radiators are not heating up because the hot water must be getting diverted to the tap. What are my options? Can I get house insurance...
  5. OneTwo

    Mystery Black Undergound Pipe Leak Repair Advice

    Hi All After having pooling water on my drive, I dug down around to find: Black pipe poly/plastic dug 450mm deep spraying water at mains pressure from small hole/crack The outside of pipe (measured with veneer caliper) at 23.5mm Pipe Runs under drive, along side of property and looks to go...
  6. D

    Repacking underground stopcock gland.

    I have an underground stopcock that is leaking a lot through the gland. I have dug down three foot to access the stopcock as I also want to move the 28mm black plastic pipe two feet to the right as well as be sure what was leaking the pipes or the gland. The tap is brass with brass nuts. What is...
  7. C

    Unsure if I have an underground water pipe leak?

    I live in an ex local authority end terrace house. I am unsure if I have an underground leak from a water pipe? Scottish Water tell me they can't help as there is no loss of water pressure and it's beyond the pavement. The tarmac at both corners are often damp, the front corner looks like the...
  8. A

    Plumbers refuse to locate underground irrigation system pipe leaks?

    Hello. Why do many plumbers refuse to locate underground irrigation system pipe leaks in an almost 2 acres hilly rural land? Others and I can't find the underwater leak(s) even though we know it's on the irrigation system's side after shutting down its main major pipe since water meter slow...
  9. J

    Underground drainage plans for building regs

    About to submit some drainage plans to building regs so I was hoping that the wonderful people on here would give some views on what they would likely object to as it's easier to make changes before submitting than after. Assuming the gradients are within spec does anything look out of place...
  10. J

    Soil pipe connections through wall underground

    Planning drainage for a new bathroom. Assuming that all the falls/gradients are correct is there anything wrong with this plan? Soil pipe from toilet goes through wall below the floor level so that I can connect a shower waste (wetroom so flush with floor). On the other side of the exterior wall...
  11. A

    Underground clay to plastic connection help

    Hi. I need to reinstate a soil pipe. The original connected to clay pipe which is incased in concrete. The pipe has broken (it was backfilled with concrete in the original rest bend) but I don’t want to have to go as far as the manhole (not sure if I even can?!). Please see attached photo at...
  12. G

    Underground waste minimum depth ?

    Hi team, Garden room project requires a new drain running to my rear most chamber. The problem is the bottom of this chamber is 0.45m so it's quite shallow. The garden room is higher so there should be enough fall but the new pipe won't be all that deep. A bit of googling and I'm getting mixed...
  13. P

    Dead leg problem? Outside tap removal, but pipes are underground...

    Hi all Got a very old looking outside tap at our house which is not in use. A plumber is visiting soon to do a bathroom refit, and whilst here will remove the tap and cap it off. I asked whether this would cause a problem with a "dead leg" and he said no, but I want to check with you guys...
  14. plumbingdoctor

    What are the right types of pipes to be used in underground piping?

    Hello guys Any thought I installed underground pipes assume any code requirements in installing a pipe when the frost gets deep in winter. I'm using a PVC
  15. Bogart

    Underground heating pipework and flushing.

    Right have decided to have a good go at my heating system so I have basically 2 questions. 1. I have an old oil boiler situated some 25m away from the house. It leaves the boiler in 28mm copper changes to 35mm copper in the boiler house , exits the boiler house and goes underground and just...
  16. 5

    Teeing off existing underground gas line (polyethylene tubing)

    I have an existing underground polyethylene tubing gas line. I want to tee off the line to supply a tankless water heater. Is there a fitting (perhaps a saddle) which would allow the line to be tapped at any point or is it necessary to go back to a connection point in the line (i.e., a union...
  17. S

    82mm underground pipe - 2 x 40mm wastes

    Hello New to this forum, the last few days I have been constantly surfing the web looking at how to rectify my pipe problem. I have a kitchen waste pipe which is 40mm that goes out through an external wall into a orange open PVC pipe which measures 82mm internal diameter which is of a open end...
  18. A

    Add 4” to man hole underground drainage

    Hello plumbers forum, would really appreciate some advice on this before consulting my plumbing books. firstly, the picture of the manhole: can I add another 4” connection to this, by drilling out the brick and concrete, what is the fitting called that I can use to attach to this ? And to...
  19. C

    Plumbing design in bungalow refurbishment

    Hello all, New to this forum so I will try especially hard to be succinct. It would be so helpful to have some feedback and see if I'm anywhere close to a solution or still miles off the mark. I am completely refurbishing a bungalow I have bought, all internal walls down, new rooms in...
  20. ShaunCorbs

    Underground Oil Line

    Need to repair an oil line that’s underground (digger/ old oil line that’s being disused) now I know it’s not the best but what’s the best practice eg flared and denso
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