Chicago 'L'

The Chicago Transit Authority 'L' is a rapid transit (metro) heavy rail system that has mostly elevated portions with some subway and at-grade segments. The system has eight lines and 145 stations at the end of 2014. The CTA carries 700,000 riders on an average weekday and is the only system outside of New York City to offer 24-hour service on at least a portion of the system (Red and Blue Lines).

Route Relations

Line	Length (km)	Stations	Route_master Relation	Routes	Route Relations
Blue Line	44.6	33	2672370 2672370	Forest Park to O'Hare	122020 122020
				O'Hare to Forest Park	2672369 2672369
Brown Line	18.1	27	2562976 2562976	Kimball to The Loop	120717 120717
				The Loop to Kimball	2562970 2562970
Green Line	33.5	31	2613599 2613599	Harlem to Ashland/63rd	2613597 2613597
				Harlem to Cottage Grove	2613598 2613598
				Ashland/63rd to Harlem	2613595 2613595
				Cottage Grove to Harlem	2613596 2613596
Orange Line	19.9	16	2578312 2578312	Midway to The Loop	443974 443974
				The Loop to Midway	2578311 2578311
Pink Line	17.0	22	2656070 2656070	54th/Cermak to The Loop	2656069 2656069
				The Loop to 54th/Cermak	443970 443970
Purple Line	26	26	2675822 2675822	Linden to the Loop	2400824 2400824
				The Loop to Linden	122552 122552
				Linden to Howard	12594572 12594572
				Howard to Linden	12594573 12594573
Red Line	35.2	33	2584583 2584583	Howard to 95th/Dan Ryan	2584584 2584584
				95th/Dan Ryan to Howard	124354 124354
Yellow Line	8.0	3	2622574 2622574	Dempster-Skokie to Howard	92653 92653
				Howard to Dempster-Skokie	2400823 2400823

Overpass API Route Diagrams and Maps

Line	Diagram	Map
Blue Line	Link	Link
Brown Line	Link	Link
Green Line	Link	Link
Orange Line	Link	Link
Pink Line	Link	Link
Purple Line	Link	Link
Red Line	Link	Link
Yellow Line	Link	Link

The generic form is here.