Since then, the official map has undergone several complete revisions, with intervening periods of comparative stability. Because the subway was originally built by three separate companies, an official map for all subway lines was not created until 1940, when the three companies were consolidated under a single operator. Many transit maps for the New York City Subway have been designed since the subway's inception in 1904. 2013 edition of the official Hertz-style subway map note that this may not reflect temporary changes in service.
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