Today’s featured picture on Wikipedia:
A view down the tracks of the Chicago ‘L’ rapid transit system at the Adams/Wabash station. The ‘L’, which began operations on June 6, 1892, is the third busiest rail mass transit system in the United States. Although nicknamed ‘L’ for the large parts of the system that are elevated, portions of the network are in a subway or at street level.
Photo by Daniel Schwen