The grade crossing with New York Avenue in Huntington was eliminated in 1909 as that road was lowered below grade. In 1910 and 1911 work was undertaken to reduce grades and eliminate sharp curves along the line between Syosset and Huntington. The project eliminated grade crossings, shortened the line by , and provided two million yards of excavated material that could be used for the reconstruction of Jamaica station. In 1911, the line's second track was extended from Hicksville to Cold Spring. In 1985, the second track was extended from just east of Syosset to just west of Huntington to alleviate a single-track bottleneck.