Background: 18th Street has a local subway station at the crossing with Seventh Avenue, served by the 1 2 trains on the IRT Broadway – Seventh Avenue Line. There used to be an 18th Street station on the IRT Lexington Avenue Line at the crossing with Park Avenue South.
Question: Which train line used to have an 18th Street Station at the crossing with Park Avenue South?
Answer:<extra_id_0>.
<extra_id_0> IRT Lexington Avenue Line<extra_id_1>