The Stockholm Underground (tunnelbana) opened in 1950, and today the system has 100 stations in use, of which 47 are underground and 53 above ground. Traffic in underground moves on left-hand side, because cars still drove on the left in Sweden when the underground system opened.
In 2017, the underground carried 353 million passengers, which corresponds to 1,2 million in a normal weekday. The 105.7-kilometre-long underground system has been called ‘the world’s longest art gallery’, with more than 90 of the network’s 100 stations decorated with sculptures, rock formations, mosaics, paintings, installations, engravings and reliefs by over 150 different artists. (Wikipedia)
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