Building the London Underground: A 158-Year (and Counting) Project

The London Underground wasn't built in a single construction phase—it's a network accumulated over 158+ years.

Key Milestones

• 1863 (Jan 10): Metropolitan Railway opens (Paddington–Farringdon)—world's first underground railway. Steam-hauled, gas-lit wooden carriages. Now part of Circle/H&C/Metropolitan lines.
• 1868: District Railway opens (South Kensington–Westminster)
• 1890: City & South London Railway—world's first deep-level electric tube (King William St–Stockwell). Now Northern Line core.
• 1900-1907: "Tube boom"—Central, Bakerloo, Piccadilly, Hampstead (Northern) lines built by Yerkes consortium.
• 1933: London Passenger Transport Board unifies underground lines.
• 1968-1971: Victoria Line—first computer-controlled, automatic train operation.
• 1979-1999: Jubilee Line (phased), including 1999 extension to Stratford (Canary Wharf catalyst).
• 2021 (Sep 20): Northern Line Extension opens—Battersea Power Station & Nine Elms stations.

Current Network

• 11 lines, 272 stations, 402 km (250 mi) track
• 45% underground (55% surface—suburban sections)
• 1.35 billion annual journeys (pre-COVID)

Ongoing & Future

• Elizabeth Line (Crossrail): Opened 2022—heavy rail, not technically "Underground" but integrated
• Bakerloo Line Extension: Planned to Lewisham/Hayes
• Deep Tube Upgrade: New trains, signaling for Piccadilly, Central, Bakerloo, Waterloo & City lines (2020s-30s)

So "how long did it take?" → 1863 to present. Each line was a distinct project (2-10 years typical). The network is perpetually expanding.