Rapid transit in the United Kingdom

Rapid transit in the United Kingdom consists of four systems: the London Underground and the Docklands Light Railway in London; the Tyne and Wear Metro in Tyne and Wear; and the Glasgow Subway. The term may also include commuter rail systems with aspects of rapid transit such as the London Overground and Elizabeth line in London, and Merseyrail in the Liverpool City Region. Rapid transit has also been proposed in other UK cities including Sheffield, Manchester, Leeds, Birmingham, Cardiff, Bristol, and Cambridge.

History
The United Kingdom is the birthplace of rapid transit, with London and Liverpool hosting the world's first and second urban rail transit and Glasgow the fourth. From 1893 to 1956, the Liverpool Overhead Railway was the only elevated rapid transit in the country, however fell into disuse being demolished in 1957. In the 20th and 21st century, the United Kingdom has chosen to not prioritise investment in rapid transit schemes; instead cities like Manchester, Sheffield, and Edinburgh have opted for trams.

List of systems
The following are usually referred to as commuter rail systems, but possess aspects of rapid transit:

Defunct systems

 * Liverpool Overhead Railway

Cancelled systems

 * Picc-Vic tunnel

Proposed systems

 * Bristol Underground
 * Cambridge Metro
 * Crossrail 2
 * Glasgow Metro (light rail)
 * North and West London Light Railway
 * South Hampshire Rapid Transit
 * Taunton metro rail
 * West London Orbital
 * West Yorkshire (Leeds) transit
 * HERT (Hertfordshire and Essex Rapid Transit)