The New York, New Haven and Hartford Railroad (often abbreviated as NYNH&H) was a major railroad in the northeastern United States. Established in the 19th century, it connected the cities of New York, New Haven, and Hartford, facilitating both passenger and freight transportation. The railroad played a crucial role in the economic development of the region, linking various industries and communities. In the early 20th century, the NYNH&H became one of the largest railroads in the U.S., known for its extensive network and innovative services. However, it faced financial difficulties in the mid-20th century, leading to its eventual merger with the Penn Central Transportation Company in 1969.