Given the following passage  "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 the following question. Note that the answer is present within the text.  Question: What is the cross section of the transportation mode?
crossing with Seventh Avenue