<P> 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 . </P>
<P> 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 . </P>
when was the elevated train in chicago built
when was the elevated train in chicago built
1892
1892