The Metropolitan Railway (MetR) was the first underground railway to be built in London

London

London is the capital city of :England and the :United Kingdom, the largest metropolitan area in the United Kingdom, and the largest urban zone in the European Union by most measures. Located on the River Thames, London has been a major settlement for two millennia, its history going back to its...

, creating the world's first metro

Rapid transit

A rapid transit, underground, subway, elevated railway, metro or metropolitan railway system is an electric passenger railway in an urban area with a high capacity and frequency, and grade separation from other traffic. Rapid transit systems are typically located either in underground tunnels or on...

 system.
The first railways to be built in the United Kingdom were constructed in the early 19th century. By 1850 there were 7 separate railway termini located in the London area: London Bridge

London Bridge station

London Bridge railway station is a central London railway terminus and London Underground complex in the London Borough of Southwark, occupying a large area on two levels immediately south-east of London Bridge and 1.6 miles east of Charing Cross. It is one of the oldest railway stations in the...

, Euston

Euston railway station

Euston railway station, also known as London Euston, is a central London railway terminus in the London Borough of Camden. It is the sixth busiest rail terminal in London . It is one of 18 railway stations managed by Network Rail, and is the southern terminus of the West Coast Main Line...

, Paddington

Paddington station

Paddington railway station, also known as London Paddington, is a central London railway terminus and London Underground complex.The site is a historic one, having served as the London terminus of the Great Western Railway and its successors since 1838. Much of the current mainline station dates...

, King's Cross, Shoreditch

Bishopsgate railway station

Bishopsgate station was a railway station located on the eastern side of Shoreditch High Street in the modern London Borough of Tower Hamlets; the western edge of the East End. It was in use from 1840 to 1964 when it was destroyed by fire...

, Waterloo

Waterloo station

Waterloo station, also known as London Waterloo, is a central London railway terminus and London Underground complex. The station is owned and operated by Network Rail and is close to the South Bank of the River Thames, and in Travelcard Zone 1....

 and Fenchurch Street. Only Fenchurch Street was located within the City of London

City of London

The City of London is a small area within Greater London, England. It is the historic core of London around which the modern conurbation grew and has held city status since time immemorial. The City’s boundaries have remained almost unchanged since the Middle Ages, and it is now only a tiny part of...

 itself.