http://www.bbc.co.uk/bbcfour/documentaries/images/indian_rail15_gal.jpg a shared heritage: Indian Railways & London Underground https://indianexpress.com/article/india/from-diamond-shape-to-oval-railway-station-signages-get-a-makeover-4501461/ From the site: "THE ROUNDEL, or the diamond-shaped signs at…
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