Is Kolkata Metro fully underground?

Line 1, or the Blue line, of Kolkata Metro (Bengali: ?????? ???????) has a total length of 31.365 kilometres (19.489 mi) serving 26 stations, of which 15 are underground, 9 are elevated and 2 at-grade. It uses the 5 ft 6 in (1,676 mm) broad gauge tracks.



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The underground or tube in London is the oldest transport system of its kind in the world. It opened on 10th January 1863 with steam locomotives.

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The London Underground first opened as an underground railway in 1863 and its first electrified underground line opened in 1890, making it the world's oldest metro system.

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