Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Warszawska Kolej Dojazdowa (Warsaw Suburban Railway, WKD) is a suburban light rail line in Poland's capital city of Warsaw. The line, together with its two branches, links Warsaw with the municipalities of Michalowice, Pruszkow, Brwinow, Podkowa Lesna, Milanowek and Grodzisk Mazowiecki to the south-west of Warsaw.The line was opened on 11 January 1927 as Elektryczna Kolej Dojazdowa (Electrical Suburban Railway), and received its current name in 1951. It was the first electric railway in Poland and the first one with automatic colour light signalling, supplied by the Swedish firm Signalbolaget. The Milanowek branch opened in 1936.

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