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preserving the New Haven Railroad click here to learn more preserving the New Haven Railroad click here to learn more latest NHRHTA News click here to read more About the NHRHTA The New Haven Railroad Historical and Technical Association is a taxexempt 501c3 nonprofit group dedicated to the preservation of the history of the New York New Haven Hartford Railroad Company and its predecessor and subsidiary companies. Latest NHRHTA News New Haven Railroad Historical and Technical Association Inc. P. O.