are there any mentions of it being expanded?
Since the opening of the original New York City Subway line in 1904, various official and planning agencies have proposed numerous extensions to the subway system.
New York City Subway
Since the opening of the original New York City Subway line in 1904, various official and planning agencies have proposed numerous extensions to the subway system.
what do they call the subway in new york Rapid transit how is it constructed? The typical tunnel construction method was cut-and-cover
wiki:19918502
New York City Subway [SEP] Expansion
Since the opening of the original New York City Subway line in 1904, various official and planning agencies have proposed numerous extensions to the subway system. One of the more expansive proposals was the "IND Second System", part of a plan to construct new subway lines in addition to taking over existing subway lines and railroad rights-of-way. The most grandiose IND Second Subway plan, conceived in 1929, was to be part of the city-operated IND, and was to comprise almost of the current subway system. By 1939, with unification planned, all three systems were included within the plan, which was ultimately never carried out.