Extract the answer to the question from the following context. Question: What street does not allow for boarding the 1 2 trains? Context: 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.
Answer:
Lexington Avenue