Elevated railways or trains, particularly the Chicago 'L' (elevated train system), or the plural of 'el,' an abbreviation for elevated railway.
Short for 'elevated,' first used in New York in the 1800s for overhead railway systems. 'El' became the standard abbreviation, and 'els' is the plural form.
Chicago's 'L' system (built starting in 1892) was revolutionary—it solved urban congestion by taking trains above street level, and it's now the second-largest rapid transit system in the US with 224 stations!
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