The Brewster Subdivision begins at Edison Junction near the community of Keysville. It starts as a wye that branches off the Valrico Subdivision. From here, it proceeds southeast to Bradley Junction, where it turns south on to the former Charlotte Harbor and Northern Railway. From Bradley Junction, the line continues south to Agrock, Fort Green Springs, and Ona before coming to a point just north of Arcadia where it connects with the Seminole Gulf Railway, a shortline that operates the continuing track south to Punta Gorda and Fort Myers. The Brewster Subdivision is CSX's second busiest line through the Bone Valley after the Valrico Subdivision. The line is dispatched through Track warrant control. The line serves three phosphate facilities operated by The Mosaic Company. Mosaic's New Wales plant is located near the northend of the line between Edison and Bradley Junction and is considered by Mosaic to be the world's largest phosphate processing facility. Four Corners Mine is located a short distance behind Agrock yard south of Bradley Junction. Agrock yard is used by Mosaic as a staging area for Four Corners Mine and operates their own locomotives and equipment from the mine to the yard. The southernmost phosphate facility on the line is Mosaic's South Pasture Mine in Fort Green Springs which was previously operated by CF Industries before it was bought by Mosaic. South Pasture Mine is currently not operating and has been idle since 2018. Though Mosaic plans to reactivate it at some point in the future. When active, South Pasture is the southernmost point of CSX's Bone Valley operations. The only traffic on the Brewster Subdivision south of South Pasture is twice-weekly mixed freight for interchange with Seminole Gulf Railway in Arcadia. This traffic is the only non-phosphate related rail traffic on the Brewster Subdivision.
History
The northern segment of the Brewster Subdivision from Edison to Bradley Junction and the Agricola spur was built by the Seaboard Air Line Railroad in 1910. From Bradley Junction south to Arcadia, the line was an extension of the Charlotte Harbor and Northern Railway built in 1911. The Charlotte Harbor and Northern Railway historically extended as far south as Boca Grande, which was once the location of a major phosphate shipping port. Therefore, the line was known as the Boca Grande Subdivision prior to 1981. The Seaboard Air Line Railroad bought the Charlotte Harbor and Northern Railway in 1926. In 1967, the Seaboard Air Line and the Atlantic Coast Line merged to form the Seaboard Coast Line Railroad. In 1980, the Seaboard Coast Line's parent company merged with the Chessie System, creating the CSX Corporation. The CSX Corporation initially operated the Chessie and Seaboard Systems separately until 1986, when they were merged into CSX Transportation. The line once had a spur track to a mine east of Agrock Yard. This defunct mine has since been redeveloped by Mosaic into the Streamsong Resort and golf course. Track south of Arcadia to Boca Grande was abandoned in 1981 after the closure of Port Boca Grande. The remaining line was subsequently renamed the Brewster Subdivision, which is named for the defunct ghost town of Brewster that was located just south of Bradley Junction. The town existed from 1910 to 1962 and played a role in the area's phosphate industry. Remnants of the town include a smokestack and a few abandoned buildings.
