The Bakerloo, Central, Jubilee, Northern, Piccadilly, Victoria and Waterloo & City lines are deep-level tubes, with smaller trains that run in circular tunnels (tubes) with a diameter of about 11 feet 8 inches (3.56 m), with one tube for each direction.
The Central line is a London Underground line that runs through central London, from Epping, Essex, in the north-east to Ealing Broadway and West Ruislip in west London. Printed in red on the Tube map, the line serves 49 stations over 46 miles (74 km), making it the longest line on the Underground.
Roding ValleyRoding Valley is London's least used tube station. Roding Valley is found on the central line. Roding Valley transports around the same number of passengers in 1 year, that London Waterloo does in 1 day.
Waterloo is Britain's largest and busiest station. London Waterloo has always been a place for important arrivals and departures, whether city commuters, holiday makers, Epsom race goers or armed forces.
Not including the Elizabeth line, which technically is not a standard Tube line, the line which is the fastest therefore is the Metropolitan Line. It is the fastest line on average across London but also has the fastest stretch of line - where trains can reach that magic speed of 60mph.