The corridor from Providence, Rhode Island, west into New York was originally chartered as three companies. The Providence and Plainfield Railroad, chartered in June 1846, would run from Providence to the Rhode Island–Connecticut state line. The Hartford and Providence Railroad, incorporated in May 1847, would continue west to Hartford, Connecticut, and the New York and Hartford Railroad, chartered and incorporated in May 1845, would continue to the New York and Harlem Railroad at Brewster, New York. In 1849, the two Connecticut companies merged to form the Hartford, Providence and Fishkill Railroad, with a modified charter to continue past Brewster to Fishkill, New York, on the Hudson River, and in 1851 the Rhode Island company was merged into it. Later that year the first section opened, from Hartford east to Willimantic. Extensions opened east to Providence in 1854 and west to Waterbury in 1855. The HP&F went bankrupt on January 1, 1858, and was run by the trustees until 1863, when it was leased by the newly formed Boston, Hartford and Erie Railroad.
The New York and New England Railroad (NY&NE) was a railroad connecting southern New York State with Hartford, Connecticut; Providence, Rhode Island; and Boston, Massachusetts. It operated under that name from 1873 to 1893. Prior to 1873 it was known as the Boston, Hartford and Erie Railroad, which had been formed from several smaller railroads that dated back to 1846. After a bankruptcy in 1893, the NY&NE was reorganized and briefly operated as the New England Railroad before being leased to the competing New York, New Haven and Hartford Railroad in 1898.