Bay Shore station was built by the
South Side Railroad of Long Island (SSRRLI) on May 20, 1868, as
Penataquit station only to be renamed
Bay Shore station in July 1868. It was replaced in 1882 and replaced again on July 17, 1912, in the style typical of stations such as
Riverhead,
Manhasset,
Northport, and
Mineola. The station also had a freight yard nearby. High-level platforms were added in 1984. The entrance to the station previously had decorative pillars on the sides, and a railroad hotel once existed behind the station plaza. It is one of the few stations on the LIRR with two station buildings. The larger building was for the westbound platform and the smaller one was for the eastbound platform. An underground pedestrian tunnel once connected the two station houses until a pedestrian bridge was built in 2009. Both station houses still stand, but the smaller one previously used for the eastbound platform was taken over by the MTA. The new overpass brought a renovation project, replacing platform lighting and adding new platform waiting shelters. ==Station layout==