 The terminal stations in diesel territory, east of Babylon, are Patchogue, Speonk, and Montauk.The Montauk Branch is double-tracked from just east of Long Island City all the way through Babylon, becoming single track at Y Interlocking (located east of the Sayville station) (a short section of track east of Long Island City is single tracked).Most Montauk Branch diesel trains operate west to NYC via the diesel-only Central Branch, joining the Main Line east of Bethpage station.