Question: Island Park is a village located in southern Nassau County. What does the train cross over on the southwest of the station?

Context paragraphs:
Barnum Island, New York: Barnum Island is a hamlet and census-designated place (CDP) in Nassau County, New York, United States.  The population was 2,414 at the 2010 census.  It occupies the eastern portion of an island situated between Long Island and Long Beach.  That island, previously known in its entirety as Barnum Island, consists entirely of the communities of Barnum Island, Island Park, and Harbor Island.

Jones Beach State Park: Jones Beach State Park (colloquially, "Jones Beach") is a state park of the U.S. state of New York.  It is in southern Nassau County, in the hamlet of Wantagh, on Jones Beach Island, a barrier island linked to Long Island by the Meadowbrook State Parkway, Wantagh State Parkway, and Ocean Parkway.

Island Park, New York: Island Park is a village located in southern Nassau County, New York in the United States.  As of the 2010 census, the village had a total population of 2,032.

Thousand Island Park, New York: Thousand Island Park is a hamlet and census-designated place in the town of Orleans in Jefferson County, New York on the southwest tip of Wellesley Island.  The hamlet is located on the St. Lawrence River, adjacent to Wellesley Island State Park, and includes the Thousand Island Park Historic District, listed on the National Register of Historic Places in 1982.

Bayville, New York: The Village of Bayville, often referred to as Pine Island, is a village located on Long Island Sound facing Greenwich, Connecticut.  The Incorporated Village of Bayville is located within the town of Oyster Bay in Nassau County, New York, United States.  The population was 6,669 at the 2010 census.  The village was incorporated in 1919 during the incorporated village movement which allowed many larger estate owners on Long Island to establish political and security control over their domains.

Glen Island Park Bath House: The Glen Island Park Bath House, located in the city of New Rochelle in Westchester County, New York, is a contributing resource in the National Register eligible Glen Island Park.  The park was originally purchased by transportation industrialist, John Starin, in 1875 to serve as a summer resort for the wealthy in New York City.  By the 1920s, with suburban growth rapidly increasing in Westchester County, the park was purchased by the Westchester County Parks Commission to provide recreational space for almost two million visitors a year in the early 1930s.  Glen Island Park is eligible for the National Register of Historic places under Criterion A for its association to recreation and Criterion C for its architecture with its Colonial Revival Style buildings.

New York's 4th congressional district: The 4th Congressional District of New York is a congressional district for the United States House of Representatives in central and southern Nassau County.  It includes the communities of Baldwin, Bellmore, East Rockaway, East Meadow, the Five Towns, Lynbrook, Floral Park, Franklin Square, Garden City, Hempstead, Long Beach, Malverne, Freeport, Merrick, Mineola, Carle Place, New Hyde Park, Oceanside, Rockville Centre, Roosevelt, Uniondale, Wantagh, West Hempstead, Westbury and parts of Valley Stream.  Democrat Kathleen Rice has represented the district since 2015.

Island Park (LIRR station): Island Park is a station on the Long Island Rail Road's Long Beach Branch serving the residents of Island Park, Barnum Island, and Harbor Isle.  It is the penultimate station on the branch.  The station can platform a 12-car train and is fully wheelchair accessible with ramps from street level.  Parking facilities are also available.  Southwest of the station the train crosses over Reynolds Channel.

Outer barrier: The outer barrier, also known as the Long Island and New York City barrier islands, refers to the string of barrier islands that divide the lagoons south of Long Island, New York from the Atlantic Ocean.  These islands include Coney Island, Long Beach Barrier Island, Island Park, Jones Beach Island, Fire Island and Westhampton Island.  The outer barrier extends 75 mi along the South Shore of Long Island, from Rockaway Beach on the New York City/Nassau County border from Long Beach Barrier Islands' western edge, to Suffolk County's east end of Shinnecock Bay.

Long Island Electric Railway: The Long Island Electric Railway was a streetcar company operating in Brooklyn, Queens, and Nassau County, New York, United States between 1894 and 1926.  The company was partially owned by the Long Island Consolidated Electric Companies, a holding company for the Long Island Rail Road and partially by August Belmont and the Interborough Rapid Transit Company.  It connected the east end of the Fulton Street El at Crescent Street station in City Line, Brooklyn with Jamaica, Queens, and ran from there to the Nassau County line at Queens Village and to Far Rockaway, Queens via Nassau County.  It also had a connection to Belmont Park.  The New York and Long Island Traction Company used trackage rights over its line from Crescent Street to Queens Village.

Supporting paragraphs: Island Park (LIRR station) Island Park, New York
Answer: Reynolds Channel