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Delhi Metro Museum. The Museum showcases the genesis, history and journey of the Delhi Metro Rail, India’s first modern public transportation system. It is a collection of display panels, historical photographs and construction and operational exhibits. Since 2009. Location: in Patel Chowk metro station. At Patel Chowk metro station. Hours (check before visiting): 10:00 to 16:00 daily except Mondays. Reference: delhimetrorail.com (official website). newshopper.sulekha.com.
Isolated circle - Ring Railway - 21 stations. Pan-shaped loop - Gurgaon line - 5 stations - opened 2013 - completed 2013 - Single-track loop. Ring under construction - Line 7 (pink) - 58.6 km - 38 stations - opened 2018 - completed 2022 - Inner Ring Road Line. Will be an isolated circle.
Several "ding-dong" noises when the doors close. Announcements are in Hindi and English (since the local language and the national language are the same – Hindi).
Delhi Metro Museum. The Museum showcases the genesis, history and journey of the Delhi Metro Rail, India’s first modern public transportation system. It is a collection of display panels, historical photographs and construction and operational exhibits. Since 2009. Location: in Patel Chowk metro station. 
