The Metropolitan Railway was, as I'm sure you know, the first Underground Railway to be built in the world, initially opening on the 10th January 1863 between Bishops Road, Paddington and Farringdon Street on the edge of the City.
Over the years it gradually extended right out into rural Buckinghamshire, Hertfordshire and Middlesex and its development was a major reason behind the development and building of the suburbs of west and north west London.
Today, as with many of London Underground's Lines, its infrastructure and trains are scheduled for renovation and replacement (see the section on Upgrade Plans) and continues to operate the A60/62 Stock.
Its only rolling stock depot is at Neasden, though trains are stabled overnight at some remote locations.
The following photos have all been supplied by Chris Cobley and provide a variety of views from around the line. Thanks to Chris for these.