Westbury station was built sometime in March 1837 with the opening of the LIRR to Hicksville. The station was closed between June and September of the same year, briefly replaced by the nearby Carle Place station. Throughout much of the mid-19th Century, the J.P. Kelsey Branch Store served as the depot. The second station was built between April and June 1883. The third station was built in 1914, and was electrified in October 1970, along with the rest of the Port Jefferson Branch between Mineola and Huntington Stations. It had a major remodeling around 1972, and another one sometime between 2001 and 2005. In 2000, a woman was stabbed to death in the underpass beneath the tracks. On February 26, 2019, a local eastbound train to Hicksville collided with a truck at the railroad crossing just East of the station as it was accelerating out of the station. A few seconds after that collision, a westbound Ronkonkoma Branch express train headed for Penn Station collided with the already slammed truck at the crossing and derailed past it, slamming into the Westbound platform's eastern end. The collision caused extensive damage to both the Westbound platform, and LIRR M7 train car #7425, killing the 3 occupants of the truck, and causing a few power poles to be replaced.
Post Avenue Bridge replacement
The station is located next to a bridge over Post Avenue that had an clearance that was installed during the 1914 rebuild. The bridge was hit by between five and nine high trucks per year between 2010 and 2016, causing numerous train delays in both directions. In October 2017, the LIRR replaced the old bridge with a new bridge. Despite the fact that the previous bridge was 103 years old, it was still considered to be in good condition. However, the bridge had to be replaced in preparation for the LIRR third track project; the new span had a clearance and a capacity of three tracks.
Station enhancements
Also as part of the third track project, the Westbury station will be upgraded to accommodate full-length 12-car trains. Both platforms would be replaced, and Platform B will be relocated. Canopies, benches, signage, and security cameras will be installed. The station, which is already compliant with the Americans with Disabilities Act of 1990, would be made more accessible via the installation of elevators and ramps, as well as a new overpass. Amenities such as Wi-Fi, USB charging stations, artwork, and digital information displays would be included in the renovation. The electrical substation at Westbury station will be replaced to make way for the third track, and a parking garage would be installed north of the station. The village of Westbury wants to redevelop the land south of the station.
Station layout
This station has two high-level side platforms, each 12 cars long. During rush hours, trains will stop at both platforms in the peak direction, though this service pattern is expected to change with the addition of a third track. Most Ronkonkoma Branch trains, some Port Jefferson Branch, and all Montauk Branch trains pass through the station without stopping.
