In 1815, the Upper East Side was a farmland and market garden district. The Boston Post Road traversed the Upper East Side, locally called the Eastern Post Road; milepost 6 was near the northeast corner of Third Avenue and 81st Street. From 1833 to 1837 the New York and Harlem Railroad, one of the earliest railway systems in the United States, was extended through the Upper East Side along Fourth Avenue (later renamed Park Avenue). A hamlet grew near the 86th Street station, becoming the Yorkville neighborhood as gradual yet steady commercial development occurred. The current street grid was laid-out between 1839 and 1844 as part of the Commissioners' Plan of 1811, so the Eastern Post Road was abandoned. The community had been referred to as Yorkville before 1867.