Under his watch a string of New York City Subway tunnel projects were planned and completed, e.g. the Battery–Brooklyn vehicular tunnel between the southern tip of Manhattan and Brooklyn.
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After the completion of these projects, Hjort was engaged with the Degnon Contracting Company of New York City, in the task of building part of the Catskill Water Supply Project, which was used to supply New York City with water.
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Hjort's task was to oversee the planning and construction of the Pennsylvania Railroads Tunnels under the Hudson River, and the Long Island Railroad Tunnels under the East River.
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