SOHO SUBWAY is a term used to describe the London Underground, which is also known as the TUBE. It is a rapid transit system serving a large part of Greater London and some parts of Buckinghamshire, Hertfordshire and Essex in the United Kingdom. The TUBE is the oldest and second longest metro system in the world, with over 400 stations and 250 miles of track. It is one of the most iconic symbols of London and is an important part of the city's transport infrastructure.