Originally Posted by vinny
CTA didn't start calling the lines by colors until 1993, when they realigned the through routes. So saying the Dan Ryan line was originally part of the Green Line is incorrect or at least misleading. When the Dan Ryan line opened it was part of the West-South route (Lake-Dan Ryan) while the North-South route was Howard-Englewood/Jackson Park:
The system map color-coded the lines in 1985 (http://www.chicago-l.org/maps/route/maps/1985map.jpg
) but the routes weren't called by those colors; in fact, green was generally the color used for "B" stop station signage from 1969 (when the Dan Ryan line went into revenue service) until 1995 (when all skip stops were eliminated). Red was the "A" stop sign color and blue was used for "A/B" stops.
Yeah, I know, I just figured it'd be easier to not have to explain all that, too.