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Metropolitan Underground line - Transport for London
Metropolitan line - Wikipedia
Metropolitan line timetable - Transport for London
A Brief History Of The Metropolitan Line | Londonist
The Metropolitan line | London Transport Museum
Metropolitan line timetable - Transport for London
Guide to the Metropolitan line – Things to se and do at the stops
The Tube: Ten Interesting Facts About the Metropolitan Line
Metropolitan line sightseeing - Experience London blog
Metropolitan line on the London Underground - doogal.co.uk