Please answer the following question: I know that the answer to the question "What type of transportation is technically being discussed here?" is in "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.". Can you tell me what it is?
Answer:
trains