Title: Chicago "L"
Passage: Chicago's ``L'' provides 24-hour service on some portions of its network, being one of only five rapid transit systems in the United States to do so. The oldest sections of the Chicago ``L'' started operations in 1892, making it the second-oldest rapid transit system in the Americas, after New York City's elevated lines.
Question: does the chicago l run 24 hours a day
Answer: yes