Skip-stop on the Chicago "L"

A blue metal sign, worn at the corners, with the following text in white Helvetica font: "State Lake Inner station ← Dan Ryan to 95/State Evanston to Linden/Wilmette AB Station" — A platform sign from State/Lake during the skip-stop era, depicting it as an "AB" station, now in a private collection

The Chicago "L" used skip-stop service, wherein certain trains would stop only at certain designated stations on a route, from 1948 to 1995. It was implemented as a way to speed up travel within a route, and was one of the Chicago Transit Authority's first reforms upon its assumption of the "L"'s operations.