The London Underground is a rapid transit system serving Greater London and some parts of the adjacent home counties of Buckinghamshire, Essex, and Hertfordshire in England. It is part of the network of transport services managed by Transport for London.
Key Facts
| Subject | London Underground |
| Category | Rapid transit system in England |
| Reading time | 1 min · Advanced |
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Reference material for this entry is drawn from the open encyclopedic record, including Wikipedia , available under the CC BY-SA 4.0 license. Images are credited individually beside each photo.