Historical Map: New North-South All-Express Service, Chicago, 1949
From a brochure introducing the now-infamous A/B stopping pattern on Chicago’s “L”. A trial run of the (mostly) alternating stopping pattern—designed to speed up operations on lines where there was no extra passing track for express services—had been carried out on the Lake Street Line in April 1948 and had been deemed a success. The next two lines to receive A/B service were the Ravenswood Line and the North-South Route as seen here. The revision […]