London subway in the past

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The network has expanded to 11 lines, and in 2016–17 carried 1.379 billion passengers, making it the world’s 11th busiest metro system. The 11 lines collectively handle approximately 4.8 million passengers a day.

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The early years following the opening of Mehrabad Airport

Mehrabad International Airport (IATA: THR, ICAO: OIII) is one of the most important airports in …