| Map Colour: | Dark Magenta |
| Year Operated: | 1863 |
| Year Opened: | 1863 |
| Year Named: | 1863 |
| Length: | 41.5 Miles (66.4km) |
| Journeys: | 58,000,000 / year |
| Stations: | Aldgate Liverpool Street Moorgate Barbican Farringdon King's Cross St. Pancras Euston Square Great Portland Street Baker Street Finchley Road Wembley Park Preston Road Northwick Park Harrow-on-the-Hill West Harrow Rayners Lane Eastcote Ruislip Manor Ruislip Ickenham Hillingdon Uxbridge North Harrow Pinner Northwood Hills Northwood Moor Park Croxley Watford Rickmansworth Chorleywood Chalfont & Latimer Chesham Amersham |
The Metropolitan Line on the London Tube Map runs from Aldgate to Chesham (with several branches) and is represented on the tube map by a dark magenta line. The line and various branches add up to 41 miles of track, responsible for handline 58,000 journeys every year.
The first underground railway in the world, the Metropolitan Line opened in January 1863 and is the 9th busiest line on the London Underground. The main line runs from Amersham to Aldgate and there are branches to Uxbridge, Chesham and Watford.

Image taken from the Metropolitan Line article on Wikipedia.
The Metropolitan Line remains the fastest line on the undergound despite speeds being cut from 70mph to 50/60mph. Along with the Central Line, it is also one of only two London Tube lines that cross the M25 motorway.
The line serves 34 stations, handling 58 million journeys per year.