 A rapid transit line in the median of the Dan Ryan Expressway was initially proposed in 1958, before the expressway was built.In 1966, Chicago voters passed a bond issue to provide $28 million in funding for new rail lines in the median of the Dan Ryan and Kennedy Expressways, qualifying the routes for federal aid funds.The Chicago Plan commission approved plans for the new routes in January 1967, estimating the cost of the Dan Ryan line to be $38 million; Sox–35th, called White Sox–Illinois Tech at the time, was included in the plans.