This is the remains of a turntable at Genesee Junction, jus south of Rochester NY.
It is yard and junction point for the R&S formerly B&O/BR&P and CSX former West Shore Div. NYC. LA&L has access via the West Shor's second track. It is located south of the West shore near the banks of Black Creek about 100 yards west of the Genesee Greenway trail.